第57回日本整形外科学会 骨・軟部腫瘍学術集会
2024/07/11

Case 1
Tumor of ankle joint
Sakura Shiraishi 1,2), Makoto Endo 1), Takumi Tomonaga 2),

Nobuhiko Yokoyama 1), Taro Mori 2), Akira Nabeshima 1),
Toshifumi Fujiwara 1), Yasuharu Nakashima 1), Yoshinao Oda 2)
1) Department of Orthopaedic Surgery, Kyushu University2) Department of Anatomic Pathology, Kyushu University

Clinical
49-year-oldHistory

male

Two years ago, the patient noticed a mass on the outer side of

his right ankle joint.
＜Physical examination＞

・Swelling on the right ankle joint・Tumor is elastic hard・No tenderness

皮膚 肉眼所見

X-ray (AP)

X-ray (lateral)

CT MPR (sagittal)

Coronal

CoronalMRI T1WICoronalMRI T2WI

Contrast enhanced MRI
T1WI (Gd, FatSAT)

Coronal

Sagittal
Axial

MRI T1WI, Gd

Differential Diagnosis
A. Giant cell tumor of bone（GCT of bone)

B. Anuerysmal bone cyst (ABC)C. Myoepithelioma
D. Extraskeletal myxoid chondrosarcoma

E. Chondrosarcoma or Atypical cartilaginous tumor

Case 2Abscopal effect following proton beam radiotherapy
for recurrent dedifferentiated chondrosarcomaMichiyuki Hakozaki1)2) Shoki Yamada3) Yoichi Kaneuchi1）Itaru Ogawa1)Takeo Suzuki1) Hiroki Sato1) Osamu Hasegawa4) Yoshihiro Matsumoto1)
1) Department of Orthopaedic Surgery
2) Higashi-Shirakawa Orthopaedic Academy3) Department of Diagnostic Pathology
4) Department of Radiology

Fukushima Medical University School of Medicine

Case presentation
Case: 69-year-old male
Chief complaint: Right buttock pain
Past history: None
Brinkman Index: 1040（52 years×20/day）
Clinical history
The patient noticed right buttock pain and visited a primary orthopedic clinic 20months ago.
He was diagnosed with right sciatica due to lumbar spinal canal stenosis andreceived conservative treatment with medication and physiotherapy, but his pain
was not improved.
Nineteen months after the first visit, he was finally diagnosed with bone tumor of
the right proximal femur by plain radiography, and referred to our hospital.

Plain RadiographyCTEnhanced MRI

T2-WI, Cor

T1-WI, Cor

T1 FS/CE, Ax

Case 3

a lesion around the left ulnaTomohisa Sakai1 Haruna Yagi2 Kunihiro Ikuta1 Yoshie Shimoyama2Hiroshi Urakawa1 Hiroshi Koike1 Takeo Fujito1 Yoshihiro Nishida1
Kennosuke Karube2 Shiro Imagama1
1. Orthopedic surgery, Nagoya Univ.
2. Department of Pathology and Laboratory Medicine, Nagoya Univ

43 years old, female
Past medical history: None in particularLife history: Right-handed
History of current illness
Oct. 20XX Left forearm pain
May. 20XX+1 Worsened
Jun. 20XX+1 Referred to our Hospital
Physical findings
A flat protuberance with tenderness on ulnar side of the left forearm
No restriction in range of motion of the wrist or elbow jointXPCTAxial

sagittalsagittalT1 axial

MRI

T2 axial

T2 STIR axial

T1 fat-sat axial

T1 fat-sat Gd(+) axial

←proximal

MRI T1 fat-sat Gd(+) axial

distal→MRI T1 fat-sat Gd(+) axial
sagittalcoronalCase 415-year-old Female
Soft Tissue Tumor of the shoulder
Masayuki Morishita1)

Makiko Yoshida2)
Kenji Kishimoto3)
1) Department of Orthopaedic Surgery, Kobe Children’s Hospital2) Department of Pathology, Kobe Children’s Hospital3) Department of Hematology and Oncology, Kobe Children’s Hospital

7/11/2024 The 57th Annual Musculoskeletal Tumor Meeting of The Japanese Orthopaedic Association

Chief Complaint:
Tender mass on the left shoulder• The patient noticed a mass on the left shoulder
three years ago. The mass gradually increased insize and the patient was referred to ourdepartment.
• Trauma History: None.
• Past Medical History: None.

Physical Examination:• A firm elastic mass 4cm indiameter was palpable from theleft shoulder to the anterior
chest area.
• Well mobile with deeper tissues.
• No effusion or redness.
• Tinel like sign: Negative.
• No restriction in shoulder jointROM.
Laboratory Findings:• Within normal limits.

X-RayEnhanced CT

MRI

T1WI

T2WIaxax

T1WIGdT1WIGdax

sag