Court Opinion

ID: 4542510
Source: CourtListenerOpinion
Date Created: 2020-06-18 20:01:47.067131+00
Date Added: 2024-06-11T12:47:43.038890
License: Public Domain

In the United States Court of Federal Claims
                                                  No. 15-1137
                                             (Filed: 17 June 2020 *)

***************************************
PITEY MORGAN,                         *
                                      *
                  Petitioner,         *                         Vaccine Act; off-table case; influenza
                                      *                         vaccine; longitudinally-extensive transverse
v.                                    *                         myelitis (“LETM”); neuromyelitis optica
                                      *                         spectrum disorder (“NMOSD”).
SECRETARY OF HEALTH AND HUMAN *
SERVICES,                             *
                                      *
                  Respondent.         *
                                      *
***************************************

      Sylvia Chin-Caplan, of Law Office of Sylvia Chin-Caplan, with whom was Timothy J.
Mason, both of Boston, MA for petitioner.

       Zoe Wade, Trial Attorney, Torts Branch, Civil Division, U.S. Department of Justice, with
whom were Joseph H. Hunt, Assistant Attorney General, C. Salvatore D’Alessio, Acting
Director, Catharine E. Reeves, Deputy Director, Heather L. Pearlman, Assistant Director, all of
Washington, DC, for respondent.

                                           OPINION AND ORDER

         Petitioner Pitey Morgan (“petitioner”) moved for review of Chief Special Master
Corcoran’s decision that petitioner is not entitled to compensation under the National Vaccine
Injury Compensation Program, 42 U.S.C. §§ 300aa-10–300aa-34 (“Vaccine Act”). Petitioner
claims he suffered longitudinally extensive transverse myelitis (“LETM”) caused by the
influenza (“flu”) vaccine he received on 16 October 2012. The Special Master denied
compensation and found petitioner did not “offer[] preponderant evidence to support the alleged
diagnosis of LETM, whereas the record evidence preponderates in favor of an alternative
diagnosis: Neuromyelitis Optica Spectrum Disorder (“NMOSD”).” Morgan v. Sec’y of Health
& Human Servs., No. 15-1137V, 2019 WL 7498665, at *1 (Fed. Cl. Spec. Mstr. Dec. 4, 2019).
Petitioner contends this decision was arbitrary and capricious because it ignored factual evidence
in the record, particularly portions of the expert reports and testimony, as well as medical
literature. For the following reasons, the Court DENIES petitioner’s motion and SUSTAINS

*
  This opinion was initially filed under seal pursuant to Vaccine Rule 18(b) of the Rules of the Court of Federal
Claims. The Court provided the parties 14 days to submit proposed redactions, if any, before the opinion was
released for publication. Neither party proposed redactions. This opinion is now reissued for publication in its
original form.
the decision of the Chief Special Master. Additionally, the Court GRANTS petitioner’s motion
for leave to exceed the page limit. 1

I. Background

        A brief recitation of the facts provides necessary context. 2

        A. Petitioner’s Medical History and the Vaccination

        Petitioner, who was 54 at the time of his October 2012 flu vaccination, suffered
preexisting conditions, including: “lower back pain, lower extremity radiculopathy, multi-level
degenerative disc disease, lumbar spondylosis, and prostatitis.” Id. at *1, *3. Beginning in
August 2009, petitioner was under the care of Physician Assistant Deborah Stayman (“PA
Stayman”) and Dr. Anthony Wilson, M.D. of Orthopaedic Associates of Muskegon for lower
back pain. Id. Petitioner “complained of pain radiating to his left thigh,” and PA Stayman noted
petitioner “exhibited decreased reflexes in his left achilles tendon.” Id. A Magnetic Resonance
Imaging (“MRI”) study conducted on 1 September 2009 showed “mild foraminal narrowing at
the L3–L4 and L4–L5 levels . . . with moderate foraminal narrowing bilaterally at L5–S1 level.
No significant spinal canal narrowing. There are disc bulges involving the lower two lumbar
levels.” Id. (quoting Pet’r’s Ex. 2, at 1; Pet’r’s Ex. 4, at 32–33). Petitioner was referred to
physical therapy for his pain but complained the physical therapy “was not assisting.” Morgan,
2019 WL 7498665, at *2. An electromyography test (“EMG”) and nerve conduction study, both
conducted on 24 November 2009, returned normal results. Id. Throughout 2009 and 2010,
petitioner received spinal nerve injections. Id.

        In January 2011, petitioner began to visit Shoreline Family Medicine, complaining of
“muscle stiffness, decreased range of motion, weakness, and radiating lower back pain.” Id. At
that time, “he was diagnosed with chronic lower back pain and degenerative disc disease.” Id.
Thereafter, he was seen monthly and “consistently complained of persistent pain, stiffness,
weakness, and radiating lower back pain, though not every symptom was present at every visit.”
Id. In May 2011, he began to complain of dizziness and neck pain. Morgan, 2019 WL 7498665,
at *2. On 30 June 2011, petitioner underwent another MRI, which showed “[s]pondylosis
causing some mild to moderate spinal canal stenosis at C5-6 and C6-7. No frank herniated disc
is appreciated.” Id. (quoting Pet’r’s Ex. 5, at 92).

       On 11 March 2012, petitioner underwent an additional MRI “for continued lower back
pain and lower extremity radiculopathy.” 3 Id. The MRI “showed ‘[m]ulti-level degenerative

1
  Petitioner also filed a motion for leave to exceed the page limit contemporaneously with filing his motion for
review. See Pet’r’s Mot. for Leave of Court to Exceed the Page Limit, ECF No. 66. Respondent indicated during
oral argument he does not oppose the motion. See Tr. at 5:8–10, ECF No. 73.
2
  As the basic facts in this case have not changed significantly since the Special Master’s 4 December 2019 decision
in this case, the Court’s recitation of the background facts herein draws from that decision.
3
  Radiculopathy is a “[d]isorder of the spinal nerve roots.” Radiculopathy, Stedmans Medical Dictionary (Westlaw,
last updated Nov. 2014). “Radiculopathy describes a range of symptoms produced by the pinching of a nerve root in
the spinal column. The pinched nerve can occur at different areas along the spine.” Radiculopathy, John’s Hopkins
Medicine, https://www.hopkinsmedicine.org/health/conditions-and-diseases/radiculopathy (last visited May 21,
2020).

                                                       -2-
disc disease and lumbar spondylosis with slight interval progression and worsening in the
appearance of degenerative change at the L4-5 level.’” Id. (quoting Pet’r’s Ex. 8, at 193).

        On 6 August 2012, petitioner was diagnosed with prostatitis 4 after being seen for his
“trouble urinating and related concerns.” Id. (citing Pet’r’s Ex. 5, at 145). A month later, he was
also diagnosed with “lower back pain and bilateral sciatica” during a follow-up visit when he
“complained of stiffness and lower back pain in addition to citing the urological symptoms of
frequency and oliguria.” Id. On 24 September 2012, petitioner was seen for “toe and thigh
numbness with an onset of three weeks prior, as well as difficulty initiating urination and waking
up during the night to urinate.” Morgan, 2019 WL 7498665, at *2. Petitioner “underwent an
ultrasound of his prostate,” which returned negative results. Id.

       On 9 October 2012, petitioner was seen again at Shoreline Family Medicine for “lower
back and pelvic pain, weakness, poor balance, fatigue, and sleep disturbances.” Id. Petitioner
underwent a CT scan on 12 October 2012, but “the results were unremarkable.” Id.

        On 16 October 2012, petitioner received the flu vaccination at issue in this case. Id. at 3.
The next day, he was seen for a urologic consultation with Dr. Arthur Golin, M.D. Id. Petitioner
explained to the physician his urinary symptoms began a year prior but had worsened over the
previous two and a half months. Morgan, 2019 WL 7498665, at *3. He also noted “increasing
pain and some weakness in the right lower extremity . . . numbness, right lateral thigh.” Id. Dr.
Golin found an “‘enlarged, benign-appearing [prostate] gland’ and reduced tone of the anal
sphincter” during a physical examination and determined petitioner suffered “urinary retention—
but with a possible neurologic component.” Id. (quoting Pet’r’s Ex. 22, at 7). On 22 October
2012, petitioner was seen for persistent symptoms at Shoreline Family Medicine and “was
prescribed medication for his prostatitis and instructed to return in one week for a follow-up
appointment.” Id. The next day, petitioner “was seen by Scott Greenwald, M.D. at Michigan
Pain Consultants for his lower back pain.” Id. He complained of lower back pain with pain
“radiating down both of his legs,” as well as “new numbness in bilateral calves.” Id. Petitioner
“was treated with a lumbar epidural steroid injection.” Morgan, 2019 WL 7498665, at *3.

        On 24 October 2012, petitioner went to the emergency room complaining of urinary
retention and “again reported that he had been experiencing urinary incontinence issues for about
a year.” Id. A catheter was placed. Id. “Later that same day, however, [petitioner] gradually
lost the strength in his legs until he was too weak to ambulate.” Id.

       Petitioner was taken by ambulance to the emergency room of a different hospital, where
he was seen “for leg weakness and urinary retention.” Id. Petitioner underwent an MRI, which
showed “[m]ild lumbar disc degeneration, which does not appear significantly changed as
compared to 3/11/2012 . . . conus medullaris appears somewhat indistinct with a suggestion of
some increased T2-weighted signal intensity, of uncertain significance given the limitations of
the low field strength magnet.” Id.

4
 Prostatitis is “[i]nflammation of the prostate.” Prostatitis, Stedmans Medical Dictionary (Westlaw, last updated
Nov. 2014).

                                                       -3-
        Petitioner was thereafter transferred to a different hospital. Morgan, 2019 WL 7498665,
at *3. He reported “that he had first noticed mild weakness in his lower extremities in August
2012 (two months before the vaccination in question)” and “patchy numbness and tingling he
experienced progressively increased over the previous two months and coincided with his
worsening urologic symptoms.” Id. Dr. Christopher Marquart, M.D., the treating physician,
noted, after physical examination, petitioner had “crude sensory level at about T12-L1 level” and
“‘patchy decreased pinprick and light touch over the anterior thighs bilaterally, top of the right
foot and bottom both the left heel and patchy over the area of the cath[eter],’ decreased strength,
and absent reflexes in his lower extremities.” Id. at *4 (quoting Pet’r’s Ex. 9, at 898). Dr.
Marquart “observe[d] evidence of nerve root clumping and enhancing in the conus—leading him
to question whether [petitioner] had experienced transverse myelitis (“TM”) or some other acute,
neuro-inflammatory process.” Id. Petitioner “was admitted to the intensive care unit for
observation, ‘to make certain he does not have any type of ascending paralysis with the recent flu
vaccination.’” Id. (quoting Pet’r’s Ex. 9, at 899).

        On 25 October 2012, petitioner underwent another MRI, which showed “edema within
the cord from T8 to the inferior tip of the cord . . . but no significant contrast enhancement.” Id.
An infectious disease consultant, Dr. Roni Devlin, M.D. saw petitioner the same day and
“indicated that the MRI was suggestive of myelitis of indeterminate etiology—though he did
later implicate the flu vaccine, noting that ‘[c]ase reports of myelitis following vaccination have
certainly been reported, but rarely.’” Id. (quoting Pet’r’s Ex. 9, at 714).

        On 27 October 2012, while still at the same hospital, petitioner was seen by Dr. Larry
Wahl, D.O. at Mercy Health “who noted that [petitioner] had experienced ‘increasing urinary
retention and some difficulty with strength in his lower extremities, climbing stairs as much as 5-
1/2 weeks ago that gradually increased’ and ‘seemed to reach a critical level 1 day after having
an epidural steroid injection on Tuesday [October 23, 2012].’” Morgan, 2019 WL 7498665, at
*4 (quoting Pet’r’s Ex. 9, at 715). Dr. Wahl’s differential diagnosis included TM, but the
physician “express[ed] some skepticism towards TM as explanatory given the extensive nature
of [petitioner’s] spinal cord edema.” Id. While in the hospital, petitioner “gradually recovered
the ability to stand, bear weight, and walk short distances with the assistance of a walker, but he
continued to experience numbness and tingling in his lower extremities.” Id.

        On 29 October 2012, petitioner was discharged from the hospital to outpatient
rehabilitation. Id. During a follow-up visit on 15 November 2012, Dr. Marquart “reiterated his
belief that Petitioner’s myelitis was ‘probably a reaction to his flu vaccine for lack of a better
explanation.’” Id. (quoting Pet’r’s Ex. 10, at 1). Another MRI conducted on 21 November 2012
“showed marked improvement in the appearance of the spinal cord with only ‘very mild patchy
cord edema.’” Id. (quoting Pet’r’s Ex. 5, at 79).

         On 13 December 2012, petitioner was seen by Dr. Douglas Gelb, M.D. at the University
of Michigan Neurology Clinic. Morgan, 2019 WL 7498665, at *4. Petitioner noted during this
visit, “since his hospital discharge on October 29, 2012, he had not noticed much improvement
in his ability to ambulate and felt as though his neurologic symptoms were worsening.” Id. At
this time, he “complained of persistent loss of sensation in his lower extremities, bladder, and
[bowels], burning pains, the development of a lump on his neck, worsening vision, sudden arm

                                                -4-
jerks, and cramping or spasms in his fingers.” Id. During a physical examination, petitioner
“exhibited mild spasticity in both lower extremities, reduced sensation from the waist down, and
absent reflexes in his ankles.” Id. at *5. Dr. Gelb “proposed that [petitioner] was experiencing
either an isolated episode of TM or the first instance of a recurrent, central nervous system
(“CNS”) demyelinating disease, such as Multiple Sclerosis (“MS”) or Neuromyelitis Optica
(“NMO”).” Id. Dr. Gelb “acknowledged that [petitioner’s] pre-vaccination symptoms ‘raise[d]
some concern that he might have had an ongoing disease process in his nervous system that
“flared up” on Oct. 24,’ but noted that those earlier symptoms were non-specific, or could be
explained by [petitioner’s] degenerative disc disease and enlarged prostate.” Id. (quoting Pet’r’s
Ex. 14, at 10–11). Dr. Gelb determined petitioner’s neurologic disease was not progressing, and
“attribut[ed] his change in vision to . . . one of the medications [petitioner] was taking.” Morgan,
2019 WL 7498665, at *5 (citing Pet’r’s Ex. 14, at 10–11). Dr. Gelb subsequently directed
petitioner to “taper off” the medication “and suggested a follow-up MRI as well as a serum
NMO antibodies test.” Id.

         On 20 December 2012, petitioner had a follow-up visit with Dr. Wahl. Id. Petitioner
“described continuing improvement of his neurologic symptoms, and he demonstrated almost
full strength throughout his lower extremities during his physical evaluation.” Id. Dr. Wahl
“ordered laboratory testing—including an NMO serum antibodies test and a brain MRI.” Id.
Between this visit and 14 February 2013, petitioner experienced some improvement in his
neurologic symptoms. Id. Both his NMO serum antibodies test and a 7 January 2013 brain MRI
returned negative results, although the NMO serum antibodies test results summary noted,
“seronegativity does not necessarily preclude a diagnosis of [NMO].” Morgan, 2019 WL
7498665, at *5 (quoting Pet’r’s Ex. 5, at 56).

        On 29 April 2013, petitioner returned to Dr. Wahl, where “he exhibited decreased
strength in both legs.” Id. Another MRI was performed on 20 May 2013, which showed,
“[i]nterval change in the appearance of the thoracic spinal cord which demonstrates diffuse but
mild expansion and increased intermedullary signal centrally between the T6 level and the
conus,” which appearance was “suggestive of [TM].” Id. (quoting Pet’r’s Ex. 5, at 70).

        Petitioner’s condition continued to deteriorate. Id. “[B]y June 17, 2013, he was unable
to stand independently and exhibited increasingly diminished strength in his bilateral lower
extremities.” Id. On 23 July 2013, petitioner, “concern[ed] that he was experiencing a relapse of
his symptoms,” was seen by a neurologist, Dr. Ivan Landon, M.D. Id. “Dr. Landon concluded
that [petitioner] had suffered at least one, maybe two, relapses and that he was likely suffering
from a polyphasic TM.” Morgan, 2019 WL 7498665, at *5.

        On 31 July 2013, petitioner “was admitted to . . . inpatient rehabilitation” for nine days,
“during which time he was treated with high dose steroids, [intravenous immunoglobin
(“IVIG”)], and intensive physical therapy.” Id. at *6. Petitioner “saw some improvement with
these treatments.” Id. Over the next year, petitioner was continually seen by Dr. Landon, who
“noted that [petitioner’s] condition appeared to be deteriorating, as he continued to experience
recurrent symptoms relapses.” Id. By 17 June 2014, petitioner became “restricted to a
wheelchair and complained of symptoms in his upper extremities.” Id. Dr. Landon observed

                                                -5-
petitioner “seemed to respond best to IVIG coupled with steroids, but [petitioner’s] insurance
company was no longer covering the cost of the IVIG treatment.” Id.

        On 15 August 2014, petitioner returned to the University of Michigan Neurology Clinic,
where he “reported that he had developed numbness in his trunk that ascended from his waist to
his mid-back, numbness in the tips of his fingers, and blurry spots of vision within the past few
months.” Morgan, 2019 WL 7498665, at *6. Dr. Gelb was uncertain “whether [petitioner’s]
clinical deterioration was due to [a] new episode of spinal cord inflammation, or simply some
systemic illness exacerbating his deficits from his initial episode (although new episodes of
inflammation seem more likely, given the severity and persistence of the new deficits, and given
the higher sensory level).” Id. (quoting Pet’r’s Ex. 14, at 95).

        Dr. Gelb therefore referred petitioner to a MS clinic and ordered “repeat MRIs of
[petitioner’s] cervical and thoracic spine and brain as well as a repeat serum NMO antibodies
test.” Id. The NMO antibodies test returned negative results, but the MRI of his thoracic MRI
showed:

       [V]olume retraction/myelomalacia, seen caudal to T8 level and extending down to
       the conus, is non masslike abnormal enhancement predominantly involving central
       and posterior portions of the spinal cord, which is more conspicuous at T12 and
       T10-T11 levels . . . The spinal cord volume loss likely represent[s] myelomalacia
       as the sequela of previous inflammatory process. Areas of T2 signal change and
       abnormal enhancement could represent reactivation of inflammatory process, this
       possibility should be correlated with deficits on physical exam and paraclinical
       test/parameters.

Id. (quoting Pet’r’s Ex. 14, at 135, 137). Petitioner’s brain MRI also showed “nonspecific small
areas of nonenhancing T2 signal prolongation in predominantly left supratentorial white matter,
these findings may represent sequela from previous inflammatory, infectious or small vessel
white matter ischemic process.” Id. (quoting Pet’r’s Ex. 14, at 137).

      On 26 November 2014, petitioner was seen by Dr. Robert Pace, M.D. at the University of
Michigan MS Clinic. Id. Dr. Pace reviewed the August 2014 MRI scans and noted:

       [S]everal nonspecific T2/FLAIR hyperintensities seen in the brain. These are not
       in a pattern that is strongly suggestive of demyelination such as would be seen with
       [MS]. However, there is a T2 hyperintensity in the fourth ventricle surrounding the
       cerebral aqueduct. This is of unclear significance, but can be seen in [NMO]
       spectrum.

Morgan, 2019 WL 7498665, at *6 (quoting Pet’r’s Ex. 14, at 110). Dr. Pace also observed
“patchy enhancement of the lower thoracic spine/conus medullaris that appears to involve some
of the cauda equina.” Id.

       Based on his review of the August 2014 MRIs and laboratory testing, Dr. Pace formally
diagnosed petitioner with “longitudinal myelitis due to [NMO], sero-negative.” Id. at *7

                                              -6-
(quoting Pet’r’s Ex. 14, at 110). Dr. Pace “advised [petitioner] to begin immune modulation
therapy” given the “high likelihood that [petitioner’s] condition would cause ‘recurrent and
potentially devastating episodes of myelitis if untreated.’” Id. (quoting Pet’r’s Ex. 14, at 110).
Although petitioner “had experienced significant improvement with IVIG treatment in the past,”
Dr. Pace “opined that the most effective treatment for patients with NMO is Rituximab.” Id.

         Petitioner did not pursue either recommended treatment, but “he pursued physical therapy
from July to September 2015.” Id. On 18 August 2015, petitioner returned to Dr. Pace, who
listed his diagnoses as “relapsing-remitting MS, Devic’s disease, and flaccid paralysis of the
lower extremities.” 5 Morgan, 2019 WL 7498665, at *7. Petitioner “reported persistent paralysis
in his lower extremities and numbness from the midthoracic region down,” but noted he felt “he
was cognitively doing better than before.” Id. Dr. Pace again ordered “MRIs and hepatitis
serologies.” Id. The MRIs “showed that the nonspecific signal hyperintensities located in the
periventricular area of the brain were stable since January.” Id. There were no reported
abnormalities of the cervical spine, “and the previously documented areas of abnormal signal in
the thoracic region of the spinal cord had resolved.” Id.

        On 20 April 2016, petitioner again returned to Dr. Pace, and reported he “was seeing
improvement with physical therapy.” Id. Although he was still wheelchair-bound, “he had not
developed any new or worsening symptoms.” Morgan, 2019 WL 7498665, at *7. “Dr. Pace
again opined that [petitioner’s] diagnosis was ‘most likely seronegative [NMO].’” Id. (quoting
Pet’r’s Ex. 53, at 42).

        Petitioner had a follow-up appointment with Dr. Pace in April 2017 with similar reports
that he continued to improve with physical therapy and did not experience new or worsening
symptoms. Id. “A physical exam revealed that [petitioner] was able to activate his hip flexors
and extensors, . . . actions he was incapable of performing the year prior.” Id. Dr. Pace also
“noted that the changes in [petitioner’s] spine were stable and that there was no evidence of new
or enhancing lesions.” Id. Dr. Pace included the following diagnoses after the appointment:
“NMO, acute TM, paralytic syndrome, and spinal stenosis of the cervical region.” Id.

        B. The Petition and Hearing Before the Special Master

        Petitioner filed his vaccine petition against the Secretary of Health and Human Services
(“respondent”) on 7 October 2015. See Pet., ECF No. 1. Petitioner requested compensation for
the transverse myelitis he allegedly developed after receipt of a flu vaccination on 16 October
2012. See id. at 1.

                1. Expert Reports

       Petitioner filed his first expert report authored by Dr. Carlo Tornatore, M.D. on 27
October 2016. See Pet’r’s Ex. 24, ECF No. 18-1. Dr. Tornatore is Professor and Chairman of
the Department of Neurology at the Georgetown University Medical Center. Id. at 7. He is also

5
 The Special Master’s decision noted that “NMO is sometimes referred to as Devic’s disease.” Morgan, 2019 WL
7498665, at *7 n.12.

                                                    -7-
the Chairman, Neurologist-in-Chief, and Executive Director of the Multiple Sclerosis Patient
Centered Specialty Home at Medstar Georgetown University Hospital. Id. Upon reviewing
petitioner’s medical history, Dr. Tornatore asserted:

         I agree with the treating physicians that [petitioner] suffered a profound
         demyelinating event within a week of receiving an influenza vaccination. This
         event was characterized by symptoms of lower extremity weakness and bladder
         dysfunction that were subsequently diagnosed as longitudinally extensive
         transverse myelitis. Notably[,] the spinal cord was edematous at multiple levels in
         October 2012, consistent with an acute event.

Id. at 2. Dr. Tornatore explained the physiology of his preferred diagnosis:

         Transverse Myelitis (TM) is a rare clinical syndrome in which an immune-mediated
         process causes neural injury to the spinal cord, resulting in varying degrees of
         weakness, sensory alterations[,] and autonomic dysfunction. The term myelitis
         refers to inflammation of the spinal cord; transverse describes the position of the
         inflammation, across the width of the spinal cord. In TM, inflammation damages
         or destroys myelin, the fatty insulating substance that covers nerve cell fibers,
         causing scars that interrupt communications between the nerves and the rest of the
         body.

Id. at 2–3. Dr. Tornatore stated “[t]he immunopathogenesis of TM is not fully understood,” but
“[i]t is thought that a variety of immune stimuli, through such processes as molecular mimicry or
superantigen-mediated immune activation, may trigger the immune system to injure the nervous
system.” Id. at 3. Based on this background, Dr. Tornatore cited to various medical journal
articles, which state “TM has been reported following vaccinations,” including the influenza
vaccination. Id. Quoting another medical journal article, Dr. Tornatore highlighted that “it is
widely reported in neurology texts that [acute TM] is a post-vaccination event.” Id. at 3–4. Dr.
Tornatore further emphasized that “the Johns Hopkins Transverse Myelitis Center’s model
diagnostic approach for evaluating patients with acute myelopathies[] includes determining
whether there is a history of recent vaccination or systemic illness.” Id. at 4. A
neuroimmunology textbook, in addition to a study of MRIs following flu vaccines, also show an
association between the flu vaccine and acute TM. 6 Id. at 5–6. Based on petitioner’s medical
history and the various cited medical journal articles, Dr. Tornatore concluded:

         [I]t is my opinion, to a reasonable degree of medical probability, that the influenza
         vaccine [petitioner] received on 10/16/2012 resulted in transverse myelitis, within
         a week of vaccination. . . . [T]here was no evidence in [his] medical record for any
         alternate cause for his condition and the temporal relationship between the
         vaccination and the onset of [his] symptoms was in an appropriate time frame . . .

6
  The authors of the Bakshi et al. article Dr. Tornatore cites in his report concluded, however, “association of TM
following the influenza vaccination does not prove cause and effect, however, because no other known causes of
[acute TM] were identified, [and] a postvaccination syndrome was diagnosed by exclusion. Pet’r’s Ex. 24, at 6.

                                                        -8-
        Lastly, [his] treating physician also speculated that the vaccination could have been
        the etiology of the transverse myelitis.

Id. at 6–7.

         On 23 June 2017, respondent filed an expert report authored by Dr. Subramaniam Sriram.
See Resp’t’s Ex. A, ECF No. 33-1. Dr. Sriram is “a Professor of Neurology and Microbiology,
Immunology and head of the Multiple Sclerosis (MS) Clinic at Vanderbilt Medical Center.” Id.
at 1. He cares for “over 1,000 patients with MS and allied neuro-inflammatory disorders
including NMO,” in addition to performing “research on the causes and treatment of MS.” Id.
After detailing petitioner’s medical history, Dr. Sriram opined “the final diagnosis in [petitioner]
is not transverse myelitis, which is attributed to monophasic disease; rather[,] his diagnosis is
relapsing longitudinal myelitis, which suggests that the condition that [petitioner] had was a
recurring relapsing disease of the spinal cord.” Id. at 5.

       Dr. Sriram “agree[d] with the final assessment of Dr. Pace from the University of
Michigan that the most likely diagnosis is longitudinal extensive myelitis seronegative
Neuromyelitis Optica.” Id. Dr. Sriram laid out the diagnostic criteria for Seronegative NMO as
follows:

        1. At least 2 core clinical characteristics occurring as a result of one or more
           clinical attacks and meeting all of the following requirements:
               a. At least 1 core clinical characteristic must be optic neuritis, acute
                   myelitis with LETM, or area post-rema syndrome.
               b. Dissemination in space (2 or more different core clinical
                   characteristics).
               c. Fulfillment of additional MRI requirements, as applicable.
        2. Negative tests for AQP4-IgG using best available detection method, or testing
           unavailable
        3. Exclusion of alternative diagnoses.

Id. at 6. Dr. Sriram determined petitioner “most likely satisfies the criteria for seronegative
neuromyelitis optica,” satisfying subsection 1(a), but expressed uncertainty “as to the
definitiveness of the diagnoses . . . because [he has] not been able to look at the MRI scans to
ensure that he has had dissemination in space (Item 1b above).” Id. Dr. Sriram suggested “anti-
Myelin Oligodendrocyte Protein (MOG) antibody mediated longitudinal transverse extensive
myelitis” as an alternative diagnosis, but “[a]t present, the serological tests for the MOG
antibody are not available, and hence will be diagnosis of exclusion.” Id. Dr. Sriram further
emphasized “[n]one of the neurologists [who treated petitioner] suggested that the vaccination
played a role in his disease,” and petitioner’s neurologic symptoms predated his vaccination. Id.

        Dr. Sriram also opined, contrary to Dr. Tornatore’s report, that “[t]he current literature
does not support a causal connection between influenza vaccine and a relapsing myelitis of any
cause.” Id. Dr. Sriram distinguished two of the case reports Dr. Tornatore cited because neither
of the patients studied in each report suffered “isolated cases of Transverse Myelitis.” Id. at 6–7.
Dr. Sriram distinguished the other case study cited for the association between flu vaccination

                                                -9-
and TM because “the clinical findings [in that study] are very suggestive of Neuromyelitis
Spectrum disorder and not an isolated TM,” also noting that report “preceded the advent of our
current understanding of NMO.” Id. at 7. Dr. Sriram further responded to Dr. Tornatore’s
report, stating he did “not provide a causal connection between TM and the influenza vaccine,
and he provides no supporting evidence to show that the influenza vaccine can cause TM.” Id.
Regarding causation, Dr. Sriram contended, “[t]he prevailing opinion on the neurological
condition of [petitioner] is that he has Neuromyelitis Optica Spectrum disorder (NMOSD), a
condition caused by an auto- antibody response to Aquaporin IV, a protein in brain cells. There
is no evidence that there is any cross reactivity between Influenza vaccine and Aquaporin IV
protein.” Id. Dr. Sriram therefore concluded: “It is my opinion that [petitioner] most likely had
NMOSD. In addition, [petitioner’s] receipt of the influenza vaccine on 10/16/2012 did not cause
or contribute to the development or the subsequent course of the disease. I hold these opinions to
a reasonable degree of medical probability.” Id.

        Petitioner filed a responsive expert report also authored by Dr. Tornatore on 5 October
2017. See Pet’r’s Ex. 47, ECF No. 36-1. In this report, Dr. Tornatore focused his analysis on
“whether [petitioner’s] disc disease could have been the etiology of his myelitis.” Id. at 1. He
answered this question in the negative because the disc disease petitioner suffered was in the
lumbar region, lower on the spine than the level at which he suffered myelitis. Id. at 1–2.
According to the 1 September 2009 MRI, petitioner had “mild foraminal narrowing at the L3-L4
and L4-L5 levels with moderate foraminal narrowing bilaterally at the L5-S1 level,” and there
were “disc bulges involving the lower two lumbar levels.” Id. at 2. The 25 October 2012 MRI,
on the other hand, identified “evidence of edema within the cord from T8 to the inferior tip of the
cord,” with the spinal cord ending at the L1 level. Id. Therefore, “from an anatomical
standpoint, the myelitis cannot be attributed to lumbar disc disease.” Id. Dr. Tornatore also
opined petitioner’s “symptoms of weakness, bladder changes[,] and sensory symptoms are due to
the myelitis and not lumbar disc disease” based on the discharge summary from petitioner’s 25
October 2012 hospital admission because “[t]he abrupt change in neurologic symptoms, in the
absence of lumbar disc disease that encroached upon the spinal canal, clearly speaks to the
myelitis as the etiology of the acute symptoms and subsequent disability.” Id. at 3.

        On 17 October 2017, the Chief Special Master ordered respondent to file a supplemental
expert report “addressing a) the distinction made by Petitioner’s Expert regarding Petitioner’s
preexisting pain, b) the recently filed MRIs and c) stating if there is a meaningful difference
between the injuries claimed by the experts for the purposes of causation.” Respondent filed this
supplemental expert report, also authored by Dr. Sriram, on 22 December 2017, responding to
the Chief Special Master’s inquiries. Resp’t’s Ex. F at 1, ECF No. 38-1. Given petitioner’s
“long history of low back pain,” Dr. Sriram agreed with Dr. Tornatore’s assessment that “the
back pain was from degenerative lumbo-sacral disc disease and does not have any bearing on the
diagnosis of inflammatory thoracic myelopathy.” Id. Dr. Sriram summarized the timeline from
when petitioner was hospitalized 24 October 2012, his continued neurologic deterioration
throughout 2013, and the 30 August 2014 MRI, which “showed abnormal enhancement
predominantly involving the central and posterior portions of the spinal cord which is more
conspicuous at thoracic 12 and thoracic 10 and thoracic 11 levels.” Id. at 2. Based on this
summary, Dr. Sriram stated:

                                              - 10 -
       The sum of these observations suggests that [petitioner’s] symptoms of spinal cord
       dysfunction:
       •      Preceded the receipt of the flu vaccination on 10/16/2012;
       •      Was relapsing remitting in nature;
       •      At least one clinical relapse and two radiological relapses were observed;
              and
       •      Was not the consequence of his back pain or the local steroid therapy.

Id. Therefore, Dr. Sriram asserted:

       Any causal connection between [petitioner’s] receipt of the flu vaccine and the
       development of neurological deficits consistent with transverse myelitis is unlikely
       since the development of gait instability and bladder complaints preceded the
       receipt of the vaccine. Furthermore, the underlying diagnosis of [petitioner’s]
       condition is relapsing myelitis, and the clinical relapse and the radiological relapse
       were seen 6-9 months after his initial presentation. Therefore, it is my opinion that
       there is no causal connection between the vaccine and the neurological problems
       that followed, given [petitioner’s] chronic course. I agree with the physicians who
       evaluated [petitioner] at the University of Michigan that he has neuromyelitis optica
       spectrum disorder.

Id.

               2. Expert Testimony

       The Chief Special Master held a one-day entitlement hearing on 23 January 2019. See
Order, ECF No. 41. Both parties’ experts testified during the hearing.

                       i. Testimony of Dr. Tornatore

        Dr. Tornatore began his testimony recognizing the complexities of petitioner’s medical
record due to his preexisting symptoms but stated there was “no question” petitioner had LETM.
Hr’g Tr. at 9:7–15, ECF No. 57. He asserted that the dramatic change between the slow tempo
of petitioner’s symptoms before the vaccination and petitioner’s condition a week after the
vaccination suggested to him the vaccine caused petitioner’s LETM. See id. at 10:16–11:25.

        In contrasting petitioner’s post-vaccination condition from his pre-vaccination condition,
Dr. Tornatore emphasized the progression of petitioner’s symptoms. See id. at 11:5–8. Dr.
Tornatore opined petitioner’s long-standing bladder issues and lower back pain were likely
attributable to petitioner’s history of prostatitis, bilateral sciatica, and degenerative disc disease.
See id. at 12:18–23, 26:20–24. He also acknowledged petitioner’s neurological exams were
“checked off as negative” until the week after the vaccination. Id. at 15:25–16:1; see also id. at
24:4. Dr. Tornatore further emphasized the importance of the tempo of change in petitioner’s
symptoms by explaining that petitioner’s spinal inflammation was so profound it could not have
predated the vaccine because petitioner would have experienced more symptoms than his bladder
issues and lower back pain with that degree of inflammation. See id. at 29:11–30:2. Dr.

                                                - 11 -
Tornatore similarly urged that the slow progression of petitioner’s pre-vaccination symptoms is
inconsistent with the “profound inflammatory event” characteristic of either LETM or NMOSD.
Hr’g Tr. at 30:3–18.

        Dr. Tornatore cited an article authored by Dr. Kerr, petitioner’s Exhibit 26, which states
“acute transverse myelitis [“ATM”] exists on a continuum of neuroinflammatory disorders,”
including NMOSD, all of which are “related to an autoimmune response.” Id. at 35:18–36:15.
Dr. Kerr writes that “it is widely reported in neurology text that ATM is a post-vaccination
event,” and it is important for a physician treating these neuroinflammatory disorders to
“determine if there’s a recent history of vaccination or systemic illness.” Id. at 37:7–8, 37:21–
38:4. Relying on the Kerr article, Dr. Tornatore invoked the theory of molecular mimicry to
explain how the flu vaccination caused petitioner’s LETM. See id. at 38:18–39:1. According to
this theory, bacteria “triggers an immune system and then the immune system attacks the heart
and the brain, as well as the joints.” Id. at 39:20–23.

        Dr. Tornatore contended it did not matter whether petitioner had LETM or NMO for
purposes of determining whether the vaccination caused the injury. See id. at 46:6–18. The
significance of diagnosis, Dr. Tornatore maintained, was merely for finding the proper treatment.
See id. at 46:19–47:9. He further explained the uncertainties with treating and diagnosing
patients with neuroinflammatory conditions, but test negative for the Aquaporin-4 antibodies that
are typical of NMOSD. Hr’g Tr. at 47:10–49:1. Moreover, Dr. Tornatore suggested petitioner,
as a male in his fifties, does not fit the typical demographic for NMOSD. See id. at 49:2–16.

       Dr. Tornatore opined the “temporal relationship . . . between the antigenic exposure and
the onset” of petitioner’s spinal inflammation was suggestive of vaccine-induced TM because it
made sense “from an immune standpoint” that petitioner’s spinal cord inflammation would begin
“roughly seven or eight days following the vaccination.” Id. at 50:5–14.

        Lastly, Dr. Tornatore noted TM is not always monophasic, meaning “it can relapse,
whether it’s from NMO or other things that can cause transverse myelitis,” and petitioner’s
relapse did not affect his assessment of petitioner’s condition. Id. at 50:18–51:9.

        On cross examination, Dr. Tornatore acknowledged petitioner’s pre-vaccination
symptoms could be symptoms of demyelinating disease, but conditioned that they could also be
attributed to other causes. See id. at 54:18–55:22, 56:19–57:8. Despite this, Dr. Tornatore
reiterated his opinion that “the greater probability is that these were preexisting symptoms that
were not referable to the spinal cord” due to the difference in the tempo of petitioner’s pre-
vaccination symptoms versus his post-vaccination symptoms. Id. at 57:20–22, 58:9–16, 59:2–6.

                      ii. Testimony of Dr. Sriram

        Dr. Sriram opined petitioner had a relapsing form of Aquaporin-4 negative NMOSD, also
called serologically negative or seronegative NMOSD. Id. at 82:18–83:6. He began his
testimony by providing an overview of the different types of demyelinating disorders of the
central nervous system. Id. at 84:5–89:10. Dr. Sriram explained “there is not a typical course”
of NMOSD, but it is considered a chronic condition because “[a]bout 60 to 70 percent of patients

                                              - 12 -
will relapse.” Id. at 90:2, 90:9–10. He also indicated a physician would reconsider his initial
diagnosis of TM if the patient relapsed because TM is monophasic. Id. at 90:20–91:4.

        Addressing the testing for NMOSD, Dr. Sriram explained there is a blood test used to
detect Aquaporin-4 autoantibodies, the autoantibodies which tend to be elevated in NMOSD
patients. Id. at 91:15–18. Dr. Sriram indicated, though, the test is “not very sensitive,” and
estimated “20 to 25 percent [of patients] are seronegative. . . . for a number of reasons.” Id. at
91:19–23. Therefore, notwithstanding petitioner’s negative Aquaporin-4 test, it was likely his
physicians “missed the window of opportunity where [they were] more likely to have the test
come [back] positive.” Id. at 92:7–9. Dr. Sriram opined petitioner’s pre-vaccination symptoms
“were indicative of NMOSD.” Id. at 92:17–19. Reviewing the progression of petitioner’s pre-
vaccination symptoms, Dr. Sriram asserted “[t]hey represent an ongoing process that began in
the spinal cord sometime in August [2012].” Id. at 96:6–7.

       Dr. Sriram contended there was no “scientifically reliable evidence to show that flu
vaccine can cause TM . . . [o]r NMOSD” or that show the “flu vaccine can worsen an
individual’s clinical course if he has TM . . . [o]r NMOSD.” Id. at 97:16–20, 98:14–19.
Discussing the Kerr article Dr. Tornatore relied on to assert the flu vaccine can cause TM, Dr.
Sriram warned “that extreme caution should be exercised in drawing a causal connection”
because it was a case report and “case reports must be viewed with caution as it is entirely
possible that the two events occurred in close proximity by chance alone.” Id. at 99:8–17.

       Dr. Sriram also addressed the timeline of the progression of petitioner’s symptoms,
contending that an onset of six to eight weeks would be a reasonable progression for petitioner’s
demyelinating condition. Id. at 100:20–101:24.

       Lastly, Dr. Sriram stated he did not believe petitioner’s vaccination caused or worsened
his condition. Id. at 105:2–4.

         On cross examination, Dr. Sriram agreed that in patients who test negative for
Aquaporin-4, the diagnostic criteria for NMSOD are more stringent. Id. at 107:10–17.
According to the seronegative NMOSD diagnostic criteria, individuals must exhibit two or more
different core clinical characteristics. Id. at 107:18–20. Dr. Sriram agreed petitioner had
myelitis, but he did not have optic neuritis or any other core clinical characteristics of
seronegative NMOSD. Id. at 108:1–4, 9–20. Further, although Dr. Sriram agreed petitioner did
not have symptoms associated with the area postrema of the brain, “he had a lesion there.” Id. at
108:5–8. Dr. Sriram therefore maintained petitioner has seronegative NMOSD based on
petitioner’s myelitis and an extending spinal lesion. Id. at 108:21–109:9. While Dr. Sriram
acknowledged petitioner’s spinal lesion having extended is not considered dissemination in
space for purposes of satisfying a second requisite core clinical characteristic of seronegative
NMOSD, he asserted the lesion “[l]iterally . . . disseminated from one region of the spinal cord
to an additional region of the spinal cord.” Id. at 109:3–15. Admittedly using the diagnostic
criteria as “guidelines,” and conceding that petitioner did not have symptoms related to the area
postrema of the brain, Dr. Sriram asserted it is “an unusual place to develop a T2 lesion” and
“[i]t’s not uncommon to have silent lesions.” Id. at 110:10, 111:21–112:20. Dr. Sriram
recognized it is uncommon for NMOSD to progress over a course of months or years but

                                               - 13 -
contended petitioner’s symptoms progressed over a six-week period, which he considered a
reasonable timeframe for NMOSD onset. Id. at 127:12–129:20.

       Finally, Dr. Sriram asserted there is no human evidence, nor is there epidemiological
evidence, that the flu vaccine can cause demyelinating disorders. Id. at 138:12–139:12.

       C. The Special Master’s Decision Denying Compensation

        On 4 December 2019, Chief Special Master Corcoran issued his decision denying
petitioner’s claim and denying compensation because petitioner did not “offer[] preponderant
evidence to support the alleged diagnosis of LETM, whereas the record evidence preponderates
in favor of an alternative diagnosis: [NMOSD],” and petitioner did not “establish[] a reliable
theory explaining how the flu vaccine could have caused his NMOSD.” Morgan, 2019 WL
7498665, at *1.

         The Chief Special Master began by defining TM and NMOSD because “[s]uch
distinctions are critical for purposes of evaluating causation in this case.” Id. at *16. The Chief
Special Master first “noted that acute demyelinating neurologic conditions like TM are
understood to occur rapidly, proceed in a monophasic manner, and often resolve without
recurrence.” Id. The Chief Special Master contrasted this with “chronic demyelinating
conditions affecting the [central nervous system (“CNS”)], like MS, [which] can initially present
as if they were TM but will invariably recur.” Id. He thus differentiated NMOSD, which “is
understood to be a relapsing and chronic CNS disease, like MS,” from “monophasic conditions
like TM, even though both involve CNS demyelination.” Id. Therefore, “[w]hile a chronic CNS
demyelinating disease may begin with an occurrence that appears discrete, like TM, the later
overall course of disease will establish that the patient did not only experience a one-time event.”
Id. This distinction was important to the Chief Special Master’s decision because although
“petitioners have on many occasions successfully established that acute forms of CNS
demyelinating conditions . . . were likely vaccine-caused[,]. . . . claimants have less consistently
succeeded in establishing that a vaccine . . . could cause a person to develop a chronic
demyelinating condition, like MS or NMOSD.” Morgan, 2019 WL 7498665, at *16.

        With this background, the Chief Special Master distinguished cases in which
compensation was awarded where the petitioner showed a flu vaccination caused NMOSD
because the theories offered in those cases were not the same as the medical theory of causation
posited in this case. Id. For example, in two of the cited cases, “the theories offered in both
cases associating the flu vaccine with NMOSD relied on the concept that the components of the
flu vaccine first caused direct injury to the endothelial cells in the body, thereby producing a
breach in the blood brain barrier, and resulting in further injury via a subsequent antibody attack
on the myelin sheath.” Id. at *17 (citing Calise v. Sec’y of Health & Human Servs., No. 08-85V,
2011 WL 1230155, at *12–21 (Fed. Cl. Spec. Mstr. Mar. 14, 2011); Davis v. Sec’y of Health &
Human Servs., No. 07-451V, 2010 WL 1444056, at *8–9 (Fed. Cl. Spec. Mstr. Mar. 16, 2010),
aff’d, 94 Fed. Cl. 53). In this case, however, “[p]etitioner simply proposes that molecular
mimicry between antigens in the vaccine and self-structures of the CNS caused harm, with less
explanation as to how the process occurred.” Id.

                                               - 14 -
        The Chief Special Master next considered whether petitioner’s pre-vaccination symptoms
were related to his neurologic injury. Id. Although some of petitioner’s post-vaccination
treating physicians considered his pre-vaccination symptoms related to his post-vaccination
symptoms, the Chief Special Master determined “the record preponderates against the
conclusion that Petitioner’s injury, however characterized, predated his receipt of the flu
vaccine.” Id. (emphasis added). The Chief Special Master based this determination on Dr.
Tornatore’s testimony “that there was a difference between the tempo of Petitioner’s long-
standing pre-vaccination symptoms and those he experienced thereafter.” Id. The Chief Special
Master additionally noted, “Dr. Sriram seems to have conceded the low likelihood that an
individual with his preferred diagnosis of NMOSD would experience a slow and progressive
series of symptoms over the relevant time period at issue.” Morgan, 2019 WL 7498665, at *17
(citing Hr’g Tr. at 127).

        Next, the Chief Special Master determined, based on his “[c]onsideration of the record as
a whole” that the record preponderates in favor of a “seronegative NMOSD diagnosis.” Id. at
*18. The Chief Special Master cited treating physicians’ views, “especially those from
physicians who saw Petitioner later in time” for persuasive evidence that petitioner suffered
NMOSD. Id. Additionally, the Chief Special Master reasoned “the record upon which treaters
based the NMOSD diagnosis preponderantly supports Respondent’s position.” Id. For example,
“the relapsing and remitting nature of [petitioner’s] disease process, plus the existence of a lesion
in the area of the brain most commonly associated with NMOSD” made Dr. Pace’s diagnosis of
NMOSD persuasive. Id. Considering the diagnostic criteria for seronegative NMOSD, the Chief
Special Master indicated despite “the difficulty in establishing those criteria, . . . there was still
evidence to fit each criterion—Petitioner initially exhibited acute myelitis with LETM, and
demonstrated brain lesions in the area postrema region of the brain.” Id. Further, responding to
petitioner’s argument that evidence of area postrema syndrome was not supported by the record,
the Chief Special Master cited “evidence of dissemination in space, because later MRI reports
from September 2015 show a brain lesion in the periventricular region of the brain . . . , as well
as a lesion extending to T6, where it had previously extended only to T8 before resolving.”
Morgan, 2019 WL 7498665, at *18. Moreover, “while Petitioner did not experience some of the
symptoms that would be associated with an area postrema lesion . . . , his treating physicians
nevertheless noted that the mere existence of an area postrema lesion supported a diagnosis of
NMOSD by itself.” 7 Id.

        The Chief Special Master determined “the overall record does not preponderate in favor
of the TM diagnosis proposed by Petitioner.” Id. While at first petitioner’s treating physicians
thought petitioner “experienced a one-time, monophasic event,” which would support a TM
diagnosis, “over time, Petitioner began experiencing a progressive course of symptoms that
suggested a relapse, and certainly resulted in more severe symptoms that impacted his
ambulation.” Id. Thus, “[t]he overall progressive course of Petitioner’s symptoms from October
2012 to 2016 . . . suggests Petitioner’s initial symptoms were part of something chronic that took

7
 As discussed infra, the record also shows the international consensus diagnostic criteria for seronegative NMOSD
merely provides guidelines for treating physicians. See Hr’g Tr. at 110:8–14. Petitioner’s treating physicians,
especially the later treating physicians, could interpret the criteria in light of their expertise treating NMO-spectrum
diseases.

                                                         - 15 -
time to unfold,” which the Chief Special Master deemed more suggestive of NMOSD than TM.
Id.

        Applying the three-pronged test for causation the Federal Circuit articulated in Althen v.
Secretary of Health & Human Services, 418 F.3d 1274, 1278 (Fed. Cir. 2005), the Chief Special
Master decided “[t]his case largely turns on Petitioner’s inability to satisfy the first and second
Althen prongs.” Id. at *19. These prongs require a petitioner to demonstrate: “(1) a medical
theory causally connecting the vaccination and the injury; (2) a logical sequence of cause and
effect showing that the vaccination was the reason for the injury; and (3) a showing of a
proximate temporal relationship between vaccination and injury.” Althen, 418 F.3d at 1278.
Concerning the first prong, the Chief Special Master noted “that Petitioner’s causation theory
includes elements that are routinely deemed valid in the Vaccine Program[;] . . . molecular
mimicry has repeatedly been embraced in Program cases as a reliable scientific mechanism for
explaining the pathophysiology of certain immune-mediated conditions, including many
demyelinating disorders.” Morgan, 2019 WL 7498665, at *19. Notwithstanding the general
recognition of molecular mimicry as a reliable medical theory in vaccine cases, “[f]or molecular
mimicry to have utility herein as a reliable mechanism, there should be some evidence that the
relevant autoantibodies that are known to drive, or are at least associated with, the resulting
demyelinating disease are likely produced as a result of the flu vaccine.” Id. The Chief Special
Master indicated, “[p]etitioner, however, offered little such evidence.” Id. at *20. Petitioner’s
medical literature “indicat[ed] that NMOSD initially manifesting as LETM could be caused by a
variety of infectious agents,” but not the influenza vaccine, and petitioner’s filings did not
“establish how an initial reaction to vaccination might be sufficient to create the kind of chronic,
CNS-oriented inflammatory process that would ultimately morph into NMOSD.” Id. The Chief
Special Master similarly found petitioner failed to satisfy the second prong because “[t]he record
does not support the conclusion that the progression of [petitioner’s] symptoms over a period of
four or more years could reasonably be attributed to a vaccination received at the outset of that
timeframe.” Id. Moreover, the Chief Special Master determined it was not “evident from the
record that the vaccine, even if it had played some role in his initial presentation, continued to
drive a pathologic process over such a lengthy period of time.” Id.

        Importantly, the Chief Special Master acknowledged “the overall record in this case
makes it difficult to establish with certainty Petitioner’s correct diagnosis (a task that I am not
even called upon to perform, since diagnosing an illness falls well beyond the purview of the
special masters in resolving Vaccine Act claims).” Morgan, 2019 WL 7498665, at *19.

       D. Petitioner’s Motion for Review

        On 3 January 2020, petitioner filed his motion for review. See Pet’r’s Mot. for Review,
ECF No. 65. Petitioner argues “[t]he Chief Special Master abused his discretion, and erred as a
matter of law, in ruling that the Petitioner’s injury was [NMOSD].” Id. at 13. Petitioner points
to the diagnostic criteria for seronegative NMOSD as set out in the article entitled, “International
consensus diagnostic criteria for neuromyelitis optica spectrum disorders,” written by Dr. Dean
M. Wingerchuk, MD, FRCP(C) et al. (“Wingerchuk”), respondent’s Exhibit E. Id. at 14.
Wingerchuk provides, in relevant part, a patient who tests seronegative must exhibit:

                                                - 16 -
       1. At least 2 core clinical characteristics occurring as a result of one or more clinical
          attacks and meeting all of the following requirements:
               a. At least 1 core clinical characteristic must be optic neuritis, acute myelitis
                  with LETM, or area postrema syndrome
               b. Dissemination in space (2 or more different core clinical characteristics)
               c. Fulfillment of additional MRI requirements, as applicable
       2. Negative tests for AQP4-IgG using best available detection method, or testing
          unavailable
       3. Exclusion of alternative diagnoses

Resp’t’s Ex. E, at 3, ECF No. 33-5. Wingerchuk also lists the following core clinical
characteristics:

       1. Optic neuritis
       2. Acute myelitis
       3. Area postrema syndrome: episode of otherwise unexplained hiccups or nausea
          and vomiting
       4. Acute brainstem syndrome
       5. Symptomatic narcolepsy or acute diencephalic clinical syndrome with NMOSD-
          typical diencephalic MRI lesions . . .
       6. Symptomatic cerebral syndrome with NMOSD-typical brain lesions

Id. Quoting expert testimony from the hearing, petitioner contends “the testimony of both
experts demonstrated that the Petitioner did not meet the diagnostic criteria for seronegative
NMOSD” due to what petitioner characterizes as “major concessions during cross examination”
of respondent’s expert, Dr. Sriram. Pet’r’s Mot. for Review at 17, 18. While both experts
agreed petitioner had acute myelitis, satisfying one of the above diagnostic criteria, petitioner
emphasizes Dr. Sriram’s testimony that petitioner’s “thoracic spinal cord lesion (i.e., his
myelitis), and the extension thereof over time, did not constitute dissemination in space.” Id. at
19 (emphasis and internal quotation marks omitted). Petitioner contends the diagnostic
requirement that a patient exhibit “2 or more different core clinical characteristics” means the
dissemination in space must “affect[] different neuroanatomic regions”—“[t]hus, by definition,
an extensive spinal cord lesion, on its own, is not evidence of dissemination in space.” Id.
(emphasis omitted). Similarly, “despite Dr. Sriram’s contention that the Petitioner had a brain
lesion ‘at the floor of the fourth ventricle,’ he conceded that the Petitioner lacked an ‘[area]
postrema syndrome, which is nausea, vomiting[,] or hiccups, which he did not have[.]’” Id. at 20
(quoting Hr’g Tr. at 83) (emphasis omitted). Petitioner therefore argues, “[d]espite this
testimony and the undisputed literature, the Chief Special Master, citing to Wingerchuk, found
that there was ‘still evidence to fit each criterion,’” a finding which petitioner claims had “no
basis in the record.” Id. at 21 (emphasis omitted).

       Petitioner further asserts the Chief Special Master’s reasoning that petitioner “had
evidence of a ‘brain lesion in the periventricular region of the brain’ based upon a September
2015 brain MRI” was contrary to the record because area postrema syndrome “requires
associated dorsal medulla/area postrema lesions,” which is a smaller region of the CNS than the

                                                - 17 -
periventricular region. 8 Id. at 24 (emphasis omitted). Petitioner maintains this finding was
accordingly contrary to portions of the record, such as Dr. Pace’s notes reviewing petitioner’s
brain MRIs. Id. at 25–26. Petitioner points to Dr. Tornatore’s testimony to show the Chief
Special Master’s “discussion that TM is a strictly ‘monophasic condition’ whereas MS and
NMOSD are ‘relapsing and chronic CNS’ diseases” was likewise unsupported by the record. Id.
at 26. Furthermore, petitioner argues “[t]he Chief Special Master’s overreliance on Dr. Pace’s
diagnosis is misplaced” because Dr. Pace “did not always adhere” to his diagnosis that petitioner
suffered “longitudinal myelitis due to [NMO], seronegative.” Id. at 28 (emphasis omitted).

        Finally, petitioner asserts “[b]y ignoring expert agreement that the diagnostic criteria for
seronegative NMOSD had not been met, and relying on his own broader criteria, for which there
was no basis in the record, the Chief Special Master substituted his own judgment for that of the
medical community.” Id. at 29. Petitioner claims the Chief Special Master’s decision
constituted legal error warranting reversal. Id.

         On 3 February 2020, respondent filed its response to petitioner’s motion for review. See
Resp’t’s Resp. to Pet’r’s Mot. for Review, ECF No. 69. Respondent argues “[p]etitioner makes
only one objection that the Chief Special Master erred in concluding that petitioner’s injury was
NMOSD, an argument that amounts to nothing more than a request that this Court impermissibly
reweigh the evidence regarding the nature of his condition.” Id. at 12. Respondent asserts,
“[c]onsistent with the Chief Special Master’s duty to determine which injury petitioner suffered
from, but ‘not through the lens of the laboratorian,’ he admitted that not all of the evidence on
diagnosis was one-sided.” Id. at 14 (quoting Morgan, 2019 WL 7498665, at *12). Therefore, “it
is unsurprising that petitioner can point to evidence in the record that cuts against the Chief
Special Master’s ultimate determination that petitioner suffered from NMOSD, but those
arguments fall far short of demonstrating that the Chief Special Master’s conclusion was based
on evidence that is ‘wholly implausible.’” Id. Pointing to Dr. Sriram’s testimony and medical
records from petitioner’s visits with Dr. Pace, respondent maintains “even though petitioner
disagrees with the Chief Special Master’s weighing of the evidence, the record provides—at
minimum—a basis for his determination that petitioner suffered from NMOSD that is not
‘wholly implausible’ and must be affirmed.” Id. at 16. Additionally, respondent argues “[e]ven
if petitioner did not have NMOSD, he has not established by preponderant evidence that he had
TM, much less that his TM was caused by an influenza vaccine.” Id. at 17. Respondent suggests
that “petitioner appears to assume that the nature of his condition is an either/or proposition: if it
is not NMOSD, it must be TM. But the record does not support this assumption.” Id. Lastly,
respondent contends “regardless of the diagnosis for petitioner’s alleged injury, his claim would
have failed because he could not have satisfied either Althen prong one or prong two based on
the evidence provided.” Id. at 19.

        The Court held oral argument on 20 May 2020. Order, ECF No. 71. Petitioner’s motion
for review is now ripe for decision.

8
 Petitioner explains the periventricular region “refers to the entire region near or around any of the cerebral
ventricles, rather than the fourth ventricle specifically. . . . [T]he fourth ventricle is the only ventricle that houses the
area postrema.” Pet’r’s Mot. for Review at 24, n.10.

                                                           - 18 -
II. Discussion

       A. Legal Standards

               1. The Court’s Standard of Review of a Special Master’s Decision

        The Vaccine Act provides this Court jurisdiction to review a Special Master’s decision
upon timely motion of either party. See 42 U.S.C. § 300aa-12(e)(1)–(2). In reviewing the record
of the proceedings before the Special Master, the Court may: (1) “uphold the findings of fact
and conclusions of law of the special master and sustain the special master’s decision;” (2) “set
aside any findings of fact or conclusion of law of the special master found to be arbitrary,
capricious, an abuse of discretion, or otherwise not in accordance with law and issue its own
findings of fact and conclusions of law;” or (3) “remand the petition to the special master for
further action in accordance with the court’s direction.” Id. § 300aa-12(e)(2). “Fact findings are
reviewed . . . under the arbitrary and capricious standard; legal questions under the ‘not in
accordance with law’ standard; and discretionary rulings under the abuse of discretion standard.”
Saunders v. Sec’y of Dept. of Health & Human Servs., 25 F.3d 1031, 1033 (Fed. Cir. 1994)
(quoting Munn v. Sec’y of Dept. of Health & Human Servs., 970 F.2d 863, 870 n.10 (Fed. Cir.
1992)).

        It is not the Court’s role “to reweigh the factual evidence, or to assess whether the special
master correctly evaluated the evidence.” Lampe v. Sec’y of Health & Human Servs., 219 F.3d
1357, 1360 (Fed. Cir. 2000) (quoting Munn, 970 F.2d at 871). The Court also does “not examine
the probative value of the evidence or the credibility of the witnesses. These are all matters
within the purview of the fact finder.” Id. (quoting Munn, 970 F.2d at 871). “Reversal is
appropriate only when the special master’s decision is arbitrary, capricious, an abuse of
discretion, or not in accordance with the law.” Snyder ex rel. Snyder v. Sec’y of Dept. of Health
& Human Servs., 88 Fed. Cl. 706, 718 (2009). The arbitrary and capricious standard “is a highly
deferential standard of review:” “[i]f the special master has considered the relevant evidence of
record, drawn plausible inferences and articulated a rational basis for the decision, reversible
error will be extremely difficult to demonstrate.” Hines ex rel. Sevier v. Sec’y of Dept. of Health
& Human Servs., 940 F.2d 1518, 1528 (Fed. Cir. 1991).

               2. The Standard of Causation in Vaccine Cases

         “A petitioner seeking compensation under the Vaccine Act must prove by a
preponderance of the evidence that the injury or death at issue was caused by a vaccine.”
Broekelschen v. Sec’y of Health & Human Servs., 618 F.3d 1339, 1341 (Fed. Cir. 2010) (citing
42 U.S.C. §§ 300aa-11(c)(1), -13(a)(1)). “A petitioner can show causation under the Vaccine
Act in one of two ways:” (1) “by showing that she sustained an injury in association with a
vaccine listed in the Vaccine Injury Table,” in which case “causation is presumed;” or (2) “if the
complained-of injury is not listed in the Vaccine Injury Table . . . the petitioner may seek
compensation by proving causation in fact.” Id. at 1341–42 (internal citations omitted). Vaccine
cases employ a burden shifting standard: “[o]nce the petitioner has demonstrated causation, she
is entitled to compensation unless the government can show by a preponderance of the evidence

                                               - 19 -
that the injury is due to factors unrelated to the vaccine.” Id. at 1342 (citing Doe v. Sec’y of
Health & Human Servs., 601 F.3d 1349, 1351 (Fed. Cir. 2010); 42 U.S.C. § 300aa-13(a)(1)(B)).

        “When a petitioner has suffered an off-Table injury, as is the case here, [the Federal
Circuit] has established the following test for showing causation in fact under the Vaccine Act:”

       [The petitioner’s] burden is to show by preponderant evidence that the vaccination
       brought about her injury by providing: (1) a medical theory causally connecting
       the vaccination and the injury; (2) a logical sequence of cause and effect showing
       that the vaccination was the reason for the injury; and (3) a showing of a proximate
       temporal relationship between vaccination and injury.

Broekelschen, 618 F.3d at 1345 (quoting Althen, 418 F.3d at 1278). Under the first prong, “[a]
petitioner must provide a ‘reputable medical or scientific explanation’ for its theory.” Boatmon
v. Sec’y of Health & Human Servs., 941 F.3d 1351, 1359 (Fed. Cir. 2019) (quoting Moberly ex
rel. Moberly v. Sec’y of Health & Human Servs., 592 F.3d 1315, 1322 (Fed. Cir. 2010)). “While
it does not require medical or scientific certainty, it must still be ‘sound and reliable.’” Id.
(quoting Knudsen ex rel. Knudsen v. Sec’y of Dept. of Health & Human Servs., 35 F.3d 543,
548–49 (Fed. Cir. 1994)). Petitioners “need not produce medical literature or epidemiological
evidence to establish causation under the Vaccine Act.” Andreu ex rel. Andreu v. Sec’y of Dept.
of Health & Human Servs., 569 F.3d 1367, 1379 (Fed. Cir. 2009). Where such evidence is
introduced, however, it must not be viewed “through the lens of the laboratorian, but instead
from the vantage point of the Vaccine Act’s preponderant evidence standard.” Id. at 1380. For
satisfying the second prong, “medical records and medical opinion testimony are favored in
vaccine cases, as treating physicians are likely to be in the best position to determine whether ‘a
logical sequence of cause and effect show[s] that the vaccination was the reason for the injury.’”
Capizzano v. Sec’y of Health & Human Servs., 440 F.3d 1317, 1326 (Fed. Cir. 2006) (quoting
Althen, 418 F.3d at 1280). Lastly, “the proximate temporal relationship prong requires
preponderant proof that the onset of symptoms occurred within a timeframe for which, given the
medical understanding of the disorder’s etiology, it is medically acceptable to infer causation-in-
fact.” de Bazan v. Sec’y of Health & Human Servs., 539 F.3d 1347, 1352 (Fed. Cir. 2008).

       B. Analysis

        Petitioner argues the Chief Special Master erred in determining petitioner’s injury was
NMOSD because in doing so, he “relied upon broader diagnostic criteria, for which there was no
basis in the record.” Pet’r’s Mot. for Review at 13. Petitioner identifies three findings in the
Chief Special Master’s decision he claims were not in accordance with law because they were
not “based ‘on the record as a whole:’” (1) that petitioner had dissemination in space due to the
extension of his thoracic spinal lesion; (2) that petitioner had dissemination in space because he
had a lesion in the periventricular region of his brain; and (3) petitioner had an area postrema
lesion due to the lesion at the floor of the fourth ventricle. Id. at 12, 13, 24 (quoting 42 U.S.C. §
300aa-12(e), § 300aa-13(a)(1)).

        Respondent responds, highlighting the Chief Special Master’s acknowledgment that
“‘[p]etitioner has raised reasonable objections’ to the NMOSD diagnosis, ‘such that I could not

                                               - 20 -
find that the NMOSD diagnosis is supported by even 75 percent of the record. However, the
evidence still preponderates in favor of the NMOSD diagnosis (a determination that merely
means more than 50 percent of the record favors that determination).” Resp’t’s Resp. to Pet’r’s
Mot. for Review at 14 (quoting Morgan, 2019 WL 7498665, at *19). Respondent therefore
argues “it is unsurprising that petitioner can point to evidence in the record that cuts against the
Chief Special Master’s ultimate determination that petitioner suffered from NMOSD, but those
arguments fall far short of demonstrating that the Chief Special Master’s conclusion was based
on evidence that is ‘wholly implausible.’” Id.

        The Chief Special Master stated, “[p]etitioner is correct in pointing out the criteria that
apply in the context of a seronegative [NMOSD] patient, as well as the difficulty in establishing
those criteria, but there was still evidence to fit each criterion—Petitioner initially exhibited
acute myelitis with LETM, and demonstrated brain lesions in the area postrema region of the
brain.” Morgan, 2019 WL 7498665, at *18 (citing Pet’r’s Ex. 5, at 56; Pet’r’s Ex. 14, at 110,
135; Pet’r’s Ex. 21, at 1; Pet’r’s Ex. 53, at 21; Resp’t’s Ex. E at 3). As previously discussed, the
diagnostic criteria for seronegative NMOSD, as outlined by Wingerchuk, require an individual
experience two or more different core clinical characteristics, in addition to MRI imagery
showing NMOSD lesions. See Resp’t’s Ex. E, at 3. Wingerchuk provides “[a]t least 1 core
clinical characteristic must be optic neuritis, acute myelitis with LETM, or area postrema
syndrome.” Id. Both experts agreed petitioner had acute myelitis, fulfilling this requirement.
See Hr’g Tr. at 68:11–12 (Dr. Tornatore); 108:1–2 (Dr. Sriram).

                1. Whether the Chief Special Master’s Finding that Petitioner had
                Dissemination in Space due to the Extension of his Thoracic Lesion was
                Supported by the Record

        The Wingerchuk diagnostic criteria require “[d]issemination in space (2 or more different
core clinical characteristics).” Resp’t’s Ex. E, at 3. Besides acute myelitis, the other core
clinical characteristics a seronegative NMOSD patient might exhibit include: (1) “Optic
neuritis;” (2) “Area postrema syndrome: episode of otherwise unexplained hiccups or nausea
and vomiting;” (3) “Acute brainstem syndrome;” (4) “Symptomatic narcolepsy or acute
diencephalic clinical syndrome with NMOSD-typical diencephalic MRI lesions;” and (5)
“Symptomatic cerebral syndrome with NMOSD-typical brain lesions.” 9 Id. The Chief Special
Master noted, however, there was, “as Dr. Sriram proposed, evidence of dissemination in space,
because later MRI reports from September 2015 show . . . a lesion extending to T6, where it had
previously extended only to T8 before resolving.” Morgan, 2019 WL 7498665, at *18 (citing
Pet’r’s Ex. 5, at 70, 80; Pet’r’s Ex. 14, at 110, 137; Pet’r’s Ex. 21, at 1). Dr. Sriram testified on
cross-examination during the hearing that he would diagnose petitioner with seronegative
NMOSD due to petitioner’s myelitis and lesions. Hr’g Tr. at 108:21–109:9. Dr. Sriram
explained, describing the visible progression of petitioner’s disease: “He had an old lesion that
stopped at T8. His new lesion in the relapse involved up to T6. So there was an extension of the
old – or a new lesion, T6 down.” Id. at 109:4–7. While Dr. Sriram acknowledged that

9
  Dr. Sriram testified that petitioner did not have any symptoms representative of acute brain syndrome,
symptomatic narcolepsy or acute diencephalic clinical syndrome, or symptomatic cerebral syndrome with NMOSD-
typical brain lesions. Hr’g Tr. at 108:9–19.

                                                   - 21 -
progression is “not typically” considered dissemination in space, the lesion “disseminated from
one region of the spinal cord to an additional region of the spinal cord.” Id. at 109:12–15.

        Petitioner quotes portions of Wingerchuk to argue Dr. Sriram’s and the Chief Special
Master’s determinations that petitioner’s spinal lesion growth satisfied the dissemination in space
requirement was contrary to evidence in the record. Pet’r’s Mot. for Review at 19–20. For
example, petitioner clarifies Wingerchuk’s requirement that a seronegative NMOSD patient
exhibit dissemination in space means “dissemination in space, affecting different neuroanatomic
regions;” in other words, “an extensive spinal cord lesion, on its own, is not evidence of
dissemination in space.” Id. at 19 (quoting Resp’t’s Ex. E, at 3) (emphasis omitted). Further,
petitioner quotes from Dr. Brian G. Weinshenker’s article titled “Neuromyelitis Spectrum
Disorders,” respondent’s Exhibit G (“Weinshenker”) 10: “[r]ecurrent isolated episodes of . . .
myelitis do not qualify [as NMOSD] [for seronegative patients].” Id. (quoting Resp’t’s Ex. G, at
4, ECF No. 47-1). Weinshenker continues, however: “NMOSD cannot be excluded in this
situation . . . .” Resp’t’s Ex. G, at 4 (emphasis added).

        To the extent petitioner contends the Chief Special Master disregarded the medical
literature in finding petitioner had dissemination in space, “[w]e generally presume that a special
master considered the relevant record evidence even though he does not explicitly reference such
evidence in his decision.” Moriarty ex rel. Moriarty v. Sec’y of Health & Human Servs., 844
F.3d 1322, 1328 (Fed. Cir. 2016) (citing Hazlehurst v. Sec’y of Health & Human Servs., 604
F.3d 1343, 1352 (Fed. Cir. 2010)). In fact, the Chief Special Master wrote, “[w]hile I have
reviewed all of the medical literature submitted in this case, I discuss only those articles that are
most relevant to my determination and/or are central to Petitioner’s case.” Morgan, 2019 WL
7498665, at *16.

         Moreover, there was sufficient evidence in the record to support the Chief Special
Master’s determination that petitioner satisfied the dissemination in space requirement for a
seronegative NMOSD diagnosis. Dr. Sriram testified petitioner’s “myelitis also involved . . . an
extension of an old lesion,” which although is “not typically” considered dissemination in space,
“[l]iterally . . . disseminated from one region of the spinal cord to an additional region of the
spinal cord.” Hr’g Tr. at 109:3–4, 10–15. Further, despite acknowledging he was “probably a
little more liberal with the interpretation of the criteria,” Dr. Sriram explained the diagnostic
criteria “are usually guidelines to physicians” and “we are not necessarily . . . boxed into this
alone.” Id. at 109:23–24, 110:9–10, 13–14. While petitioner contends there was no basis in the
record for the Chief Special Master’s findings, Dr. Sriram’s testimony provides a basis in the
record. It is not the Court’s role “to reweigh the factual evidence, or to assess whether the
special master correctly evaluated the evidence. And of course we do not examine the probative
value of the evidence or the credibility of the witnesses. These are all matters within the purview

10
  Dr. Dean M. Wingerchuk, M.D., is also an author of the Weinshenker article, respondent’s Exhibit G. See
Resp’t’s Ex. G, at 1. Both Wingerchuk and Weinshenker outline the diagnostic criteria for NMOSD. Compare
Resp’t’s Ex. E, at 3, with Resp’t’s Ex. G, at 4. Throughout the Chief Special Master’s decision and subsequent
briefing, respondent’s Exhibit E is referred to as “Wingerchuk” and respondent’s Exhibit G as “Weinshenker.” See,
e.g., Morgan, 2019 WL 7498665, at *8; Pet’r’s Mot. for Review at 14–15.

                                                     - 22 -
of the fact finder.” Munn v. Sec’y of Dept. of Health & Human Servs., 970 F.2d 863, 871 (Fed.
Cir. 1992).

        With Dr. Sriram’s testimony, based on treating physician’s records, the Court cannot say
the Chief Special Master’s finding that petitioner had dissemination in space was “wholly
implausible.” See Lampe, 219 F.3d at 1363 (“Since the special master’s conclusion was based
on evidence in the record that was not wholly implausible, we are compelled to uphold that
finding as not being arbitrary and capricious.”). The Chief Special Master reasonably relied on
expert testimony and evidence of dissemination in space to support his finding that petitioner
suffered from seronegative NMOSD. See Broekelschen, 618 F.3d at 1348 (quoting Hines, 940
F.2d at 1528) (“‘[R]eversible error is “extremely difficult to demonstrate” if the special master
“has considered the relevant evidence of record, drawn plausible inferences and articulated a
rational basis for the decision.”’”). The Chief Special Master’s finding that evidence supported
dissemination in space was accordingly not “arbitrary, capricious, an abuse of discretion, or
otherwise not in accordance with law” because it was supported by the record. 42 U.S.C. §
300aa-12(e)(2)(B).

               2. Whether the Chief Special Master’s Finding that Petitioner had
               Dissemination in Space Because of a Periventricular Brain Lesion was Based
               in the Record

         Petitioner similarly challenges the Chief Special Master’s finding that there was, “as Dr.
Sriram proposed, evidence of dissemination in space, because later MRI reports from September
2015 show a brain lesion in the periventricular region of the brain.” Morgan, 2019 WL
7498665, at *18 (citing Pet’r’s Ex. 14, at 110; Ex. 21, at 1). Petitioner quotes the Wingerchuk
criteria, which state “area postrema syndrome ‘requires associated dorsal medulla/area postrema
lesions,’” and explains “[t]he periventricular region, by contrast, expands beyond the dorsal
medulla and area postrema.” Pet’r’s Mot. for Review at 24. Petitioner therefore argues “the
Chief Special Master appears to have conflated the ‘periventricular region of the brain’ with the
more specific MRI requirements for area postrema syndrome.” Id. (quoting Resp’t’s Ex. E, at 3).
Additionally, petitioner claims although the Chief Special Master suggested Dr. Sriram proposed
a periventricular lesion constitutes evidence of dissemination in space, there is no evidence in the
record of Dr. Sriram “rel[ying] upon a ‘periventricular lesion’ in his opinion.” Id. Petitioner
quotes from Dr. Pace’s notes where he states the MRIs show “nonspecific . . . hyperintensities
seen in the brain,” which he specifies are “not in a pattern that is strongly suggestive of
demyelination such as would be seen with multiple sclerosis.” Id. at 25 (quoting Pet’r’s Ex. 14,
at 110).

        Petitioner cites Dr. Pace’s notes to support his contention; however, reviewing the MRI
images of hyperintensities in petitioner’s brain, Dr. Pace noted they “can be seen in
neuromyelitis optica spectrum, as this is the location of high concentration Aquaporin 4
channels.” Pet’r’s Ex. 14, at 110. Additionally, the Chief Special Master cites petitioner’s 19
September 2015 MRI report. See Morgan, 2019 WL 7498665, at *18; Pet’r’s Ex. 21. That
report notes, ‘[t]here are scattered foci of hyperintense FLAIR and T2-weighted signal identified
within the bilateral periventricular and subcortical white matter.” Pet’r’s Ex. 21, at 1 (emphasis
added). Contrary to petitioner’s contentions, this report suggests petitioner had lesions in the

                                               - 23 -
periventricular region of the brain. Moreover, Dr. Sriram testified that “very few diseases . . .
give you a postrema lesion in the floor of the fourth ventricle.” Hr’g Tr. at 110:15–17.

        To the extent petitioner disagrees with the terminology the Chief Special Master used,
this does not rise to the level of arbitrary or capricious that would justify setting aside factual
findings. Given Dr. Pace’s notes suggesting petitioner’s brain lesion could be seen with
NMOSD , the radiology report of petitioner’s September 2015 MRI suggesting petitioner had a
bilateral periventricular lesion, and Dr. Sriram’s testimony, the Court cannot say the Chief
Special Master’s finding was “wholly implausible.” Cedillo v. Sec’y of Health & Human Servs.,
617 F.3d 1328, 1338 (Fed. Cir. 2010) (quoting Lampe, 219 F.3d at 1363). Petitioner’s arguments
amount to a request that the Court reweigh the evidence—a task the Chief Special Master
completed. Since the Chief Special Master’s finding that petitioner had a periventricular lesion
suggestive of NMOSD was based in the record, the Court must uphold it as not arbitrary or
capricious. Id. (quoting Lampe, 219 F.3d at 1363) (“We ‘do not sit to reweigh evidence. [If] the
Special Master’s conclusion [is] based on evidence in the record that [is] not wholly implausible,
we are compelled to uphold that finding as not arbitrary or capricious.’”).

               3. Whether the Chief Special Master’s Finding that Petitioner’s Area
               Postrema Lesion Supported a NMOSD Diagnosis was Based in the Record

        Petitioner also challenges the Chief Special Master’s finding that petitioner’s “brain
lesions in the area postrema region of the brain” supported a seronegative NMOSD diagnosis by
satisfying area postrema syndrome as the second core clinical characteristic. See Pet’r’s Mot. for
Review at 21; Morgan, 2019 WL 7498665, at *18. Petitioner points to Wingerchuk’s criteria,
which explain that area postrema syndrome, a core clinical characteristic of seronegative
NMOSD, “requires both a presentation of symptoms (i.e., ‘intractable hiccups or nausea and
vomiting’) and MRI findings ‘meant to enhance diagnostic specificity [that] must also be
present.’” Pet’r’s Mot. for Review at 20 (quoting Resp’t’s Ex. E, at 3) (emphasis and internal
footnotes omitted). The Chief Special Master acknowledged petitioner’s argument that
“evidence of area postrema syndrome [was] not strongly supported by the record.” Morgan,
2019 WL 7498665, at *18 (emphasis omitted). The Chief Special Master also noted, however,
“while Petitioner did not experience some of the symptoms that would be associated with an area
postrema lesion . . . , his treating physicians nevertheless noted that the mere existence of an area
postrema lesion supported a diagnosis of NMOSD by itself.” Id. (citing Pet’r’s Ex. 14, at 110).

        During oral argument, petitioner argued the exhibit the Chief Special Master cited for the
proposition that petitioner’s “treating physicians note[d] that the mere existence of . . . [an] area
of postrema lesion supported a diagnosis of NMO by itself” did not in fact support that assertion.
Tr. at 21:23–22:10, ECF No. 73. Respondent conceded the Chief Special Master likely conflated
treating physician statements with Dr. Sriram’s testimony during the hearing. See id. at 26:24–
28:2. While the exhibit the Chief Special Master cited—Dr. Pace’s notes from petitioner’s 26
November 2014 visit—does not state the mere existence of an area postrema lesion meant
petitioner had NMOSD, Dr. Pace noted in his review of petitioner’s 31 August 2014 MRI:

                                               - 24 -
        There are several nonspecific T2/FLAIR hyperintensities seen in the brain. 11 These
        are not in a pattern that is strongly suggestive of demyelination such as would be
        seen with multiple sclerosis. However, there is T2 hyperintensity in the fourth
        ventricle surrounding the cerebral aqueduct. This is of unclear significance, but
        can be seen in neuromyelitis optica spectrum, as this is the location of high
        concentration of Aquaporin 4 channels.

Pet’r’s Ex. 14, at 110 (emphasis added). Dr. Sriram testified on cross-examination during the
hearing “there are very few diseases that give you a postrema lesion in the floor of the fourth
ventricle.” Hr’g Tr. at 110:15–17. Dr. Sriram continued: “[I]rrespective if the patient did not
have hiccups and did not have vomiting and nausea, this is something that clinicians pay
attention to.” Id. at 110:19–21. He also testified the lesion in the floor of the fourth ventricle
was “very persuasive for an NMO spectrum disorder.” Id. at 111:12–13. Further, he testified
that although petitioner did not exhibit the clinical systems of area postrema syndrome (hiccups
or nausea and vomiting), “[i]t’s not uncommon to have silent lesions.” Id. at 112:20.

        As previously discussed, to the extent petitioner claims the Chief Special Master
disregarded the Wingerchuk criteria, the Court “presume[s] that a special master considered the
relevant record evidence even though he does not explicitly reference such evidence in his
decision.” Moriarty ex rel. Moriarty, 844 F.3d at 1328 (citing Hazlehurst, 604 F.3d at 1352).
Additionally, although citation to one treating physician’s records does not support the
proposition that petitioner’s area postrema lesion standing alone supports a NMOSD diagnosis,
there is ample evidence in the record to support the Chief Special Master’s finding that
petitioner’s area postrema lesion supported a seronegative NMOSD diagnosis. Both Dr. Pace’s
notes from reviewing petitioner’s MRIs and Dr. Sriram’s testimony lend further support for the
Chief Special Master’s finding. Petitioner’s argument asks the Court to reweigh which pieces of
evidence support discrete findings, but that is not the Court’s role in reviewing a special master’s
decision. “We ‘do not sit to reweigh the evidence. [If] the Special Master’s conclusion [is]
based on evidence in the record that [is] not wholly implausible, we are compelled to uphold that
finding as not being arbitrary or capricious.’” Cedillo v. Sec’y of Health & Human Servs., 617
F.3d 1328, 1338 (Fed. Cir. 2010) (quoting Lampe, 219 F.3d at 1363). The Chief Special
Master’s finding, based on the evidence, is not “wholly implausible.” Id. The Court therefore
finds the Chief Special Master’s finding was not arbitrary or capricious and was supported by the
record. Lampe, 219 F.3d at 1360 (“The arbitrary and capricious standard of review is difficult
for an appellant to satisfy with respect to any issue, but particularly with respect to an issue that
turns on the weighing of evidence by the trier of fact.”).

                 4. Petitioner’s Burden to Prove the Flu Vaccine Caused LETM

11
   Upon further review by the Court, it seems the confusion may be that Dr. Pace notes T2/FLAIR “hyperintensities”
rather than “lesions.” Hyperintensities on T2-weighted MRI images of the brain depict white matter lesions, as
“[w]hite matter lesions are considered present if hyperintense on T2 weighted . . . images.” See Stéphanie Debette
& H.S. Markus, The clinical importance of white matter hyperintensities on brain magnetic resonance imaging:
systematic review and meta-analysis, The BMJ (July 26, 2010), https://www.bmj.com/content/341/bmj.c3666.

                                                     - 25 -
        Respondent argued in its response to petitioner’s motion for review “[m]erely attempting
to cast doubt about the Chief Special Master’s conclusion regarding the diagnosis does not
address” the requirements that “petitioner . . . prove by preponderant evidence which injury he
suffered, and that the injury was caused by a vaccine.” Resp’t’s Resp. to Pet’r’s Mot. for Review
at 17. Respondent thus asserted “petitioner appears to assume that the nature of his condition is
an either/or proposition: if it is not NMOSD, it must be TM. But the record does not support
this assumption.” Id. During oral argument, respondent expounded on these arguments,
contending it was not sufficient for petitioner to allege molecular mimicry, a medical theory
which has been accepted in Vaccine Program cases before, establishes the link of causation
between the vaccine and injury. See Tr. at 60:14–61:3. Respondent explained, “irrespective of
which diagnosis the [Chief] Special Master ultimately landed on, one of the things that he did
note was that for molecular mimicry to have utility in this case, there should be some evidence of
the relevant antibodies that are known to drive or at least are associated with the resulting
demyelinating disease are likely produced as a result of the flu vaccine.” Id. at 61:4–11. Dr.
Tornatore’s testimony, in contrast, was “exceptionally vague,” respondent contends, and “[t]here
was really nothing sufficient to tether this theory to the flu vaccine that the Petitioner received
and this theory does not explain the presence of the lesion that was in the Petitioner’s brain.” Id.
at 62:1–5. Respondent therefore argued, even if “the Court were to rule that NMOSD is not the
correct diagnosis, that does not mean that LETM is the correct diagnosis.” Id. at 62:6–8.

         In response, petitioner argued “[w]hat the [Chief] Special Master is looking for here is, in
fact, direct contradiction to his own finding from just three years ago,” citing Johnson v.
Secretary of Health & Human Services, No. 14-113V, 2017 WL 772534 (Fed. Cl. Spec. Mstr.
Jan. 6, 2017). Id. at 63:22–25. Petitioner pointed to footnote 25 of that case, where the Chief
Special Master wrote: “Petitioner did not show exactly which antigen would be involved in the
proposed cross-reactivity process, nor did she offer any studies showing molecular mimicry
could happen between [immune thrombocytopenic purpura (“ITP”)] and [human papillomavirus
(“HPV”)]. But to require Petitioner to have done so amounts to heightening the burden of proof
beyond what a claimant need offer.” Johnson, 2017 WL 772534, at *19 n.25. Petitioner
therefore asserted, “[a] petitioner does not have to show a precise, exact biological mechanism of
injury. To do so inappropriately heightens the petitioner’s burden to the level of scientific
certainty, a level that’s not required under preponderant evidence.” Tr. at 64:14–18.

         The Chief Special Master recognized “molecular mimicry has repeatedly been embraced
in Program cases as a reliable scientific mechanism for explaining the pathophysiology of certain
immune-mediated conditions, including many demyelinating disorders.” Morgan, 2019 WL
7498665, at *19. As applied to petitioner’s case, however, the Chief Special Master found
petitioner offered little evidence to show “the relevant autoantibodies that are known to drive, or
at least associated with, the resulting demyelinating disease are likely produced as a result of the
flu vaccine,” which the Chief Special Master noted was “reasonable to require” of a petitioner
“when evaluating the success of the claimant’s [Althen] prong one showing.” Id. (citing W.C. v.
Sec’y of Health & Human Servs., 704 F.3d 1352, 1361 (Fed. Cir. 2013)). The Chief Special
Master observed, “[a]t best, there are some references in the literature indicating that NMOSD
initially manifesting as LETM could be caused be a variety of infectious agents (i.e., the herpes
virus, dengue fever, tuberculosis, etc.). But this list does not also include the influenza wild
virus. Nor did petitioner’s filings establish how an initial reaction to a vaccination might be

                                               - 26 -
sufficient to create the kind of chronic, CNS-oriented inflammatory process that would
ultimately morph into NMOSD.” Id. at *20. The Chief Special Master therefore found
petitioner failed to demonstrate with “reliable and persuasive evidence . . . that the flu vaccine
could cause a chronic form of CNS demyelinating disease such as NMOSD, that would unfold
over a lengthy period of time.” Id.

        The Johnson case is inapposite to the instant case. In Johnson, the parties largely agreed
the petitioner suffered from ITP; they merely disagreed whether the HPV vaccine was a
contributing factor to the petitioner’s condition. Johnson, 2017 WL 772534, at *15. Here, the
parties dispute what petitioner’s injury was, and this is the crux of petitioner’s motion for review.
Notably, however, petitioner does not argue in his motion for review the flu vaccine caused
LETM, nor does he challenge the Chief Special Master’s holding that petitioner failed to meet
his burden to prove the flu vaccine caused his injury. Respondent therefore asserted during oral
argument “even if [the Court] determine[s] that it’s not NMOSD, . . . it’s not necessarily the case
that that finding would translate to a finding that the Petitioner has met his burden to demonstrate
a legally cognizable injury.” Tr. at 13:25–14:4. Likewise, respondent argued “ruling out
NMOSD does not automatically rule in LETM as the Petitioner’s ultimate diagnosis. And,
again, it is the Petitioner that bears the burden of demonstrating that and they did not challenge
or raise an appeal” of the Chief Special Master’s “finding that petitioner failed to meet its burden
of showing a cognizable injury.” Id. at 28:11–12, 19–23. Contrary to petitioner’s argument, the
Chief Special Master did not raise the burden of causation in this case; petitioner simply failed to
meet it. As the Chief Special Master stated, the medical literature petitioner offered did not
connect the flu vaccine or influenza wild virus to a demyelinating disorder that eventually
manifests as NMOSD. Morgan, 2019 WL 7498665, at *20. The Chief Special Master was not
requiring petitioner to “show exactly which antigen would be involved in the proposed-cross
reactivity process.” Johnson, 2017 WL 772534, at *19 n.25. The Chief Special Master was
looking for evidence “involving the flu vaccine . . . and its association with NMOSD, or proof
that immune system stimulation can at least initiate a chronic process.” Morgan, 2019 WL
7498665, at *19. Therefore, even if the Court found the Chief Special Master’s finding that
petitioner suffered from NMOSD was arbitrary and capricious, that does not mean petitioner met
his burden of proof to show the flu vaccine caused LETM.

III. Conclusion

       For the foregoing reasons, the Court SUSTAINS the Chief Special Master’s decision
because it was not arbitrary, capricious, or not otherwise in accordance with law. The Court
therefore DENIES petitioner’s motion for review. The Clerk of Court is directed to enter
judgment for respondent.

       IT IS SO ORDERED.

                                                        s/ Ryan T. Holte
                                                        RYAN T. HOLTE
                                                        Judge

                                               - 27 -