69 YO female received one dose of J&J vaccination on 3/12/21.  4/8: Patient complaint of epigastric abdominal pain almost nightly since March 12 (coincided with her COVID vaccination) described as 10/10, crampy and without radiation. CT abdominal and pelvis with contrast showed infiltrating mass in the left hepatic lobe concerning for intrahepatic cholangiocarcinoma with reactive adenopathy. Additionally, left mid ovarian vein thrombus found. No thrombus in the renal veins or IVC. 4/28: Venous duplex demonstrated bilateral leg acute DVT. Eliquis was started. 5/7: Pt underwent laparoscopic biopsy/paracentesis. Eliquis was held 2 days prior to laparoscope...5/11: Pt presented to hospital with complaints of generalized weakness, fatigue and leg pain. CTPA showed bilateral PE. Pt received heparin drip and was switched back to Eliquis on discharge. Echocardiogram on 5/12 noted mobile round mass in RV junction, right atrial mass; presumed to be a thrombus. Pt additionally with elevated troponin, determined to likely demand ischemia related to PE; EKG without any acute changes. Discharged on 5/24. 5/27: Patient started on chemotherapy with gemcitabine/cisplatin for metastatic intrahepatic cholangiocarcinoma.  6/4: Presented to the ED again due to worsening dyspnea and home pulse ox readings in the 70s. CT chest showed moderate burden of bilateral obstructive pulmonary emboli with no overt RV strain. EKOS and clot retrieval was contraindicated d/t thrombocytopenia. Was noted to have demand ischemia, and transitioned from eliquis to heparin gtt. Vascular was consulted for eval of her ischemic right foot, and deemed that it needed amputation, but would be a high risk surgery.  6/8: Patient was transferred to this reporting institution for second opinion requested by the family. Upon arrival, patient was found to be obtunded and hypotensive requiring heated high flow nasal cannula and vasopressor with norepinephrine. Code status was deemed DNRCCA/Do not intubate per family. Bedside ultrasound was concerning for an LV mass. Cardiology and Vascular surgery were consulted and recommended that the foot be amputated as well, but requested further workup with ECHO and CTA chest/abdomen/pelvis to further evaluate the LV mass. During admission workup, she was incidentally found to be COVID PCR positive. She was started on DEXA-ARDS prednisone dosing, remdesivir, and placed in enhanced droplet isolation.  Her hospital course was complicated by acute hypoxemic respiratory failure due to pulmonary emboli, COVID-19 infection, and underlying malignancy requiring heated high flow nasal cannula. Empiric cefepime was started to treat any underlying superimposed pneumonia. Due to extensive clot burden with limb ischemia, as well as + COVID, she was systemically anticoagulated with a heparin drip despite her thrombocytopenia. She was intermittently given platelet transfusions in order to keep platelet count >30. TTE was obtained on 6/11 which showed large masses in right ventricle and right atrium, vegetations on mitral valve, aortic valve, and tricuspid valve, and probable mass in IVC. She also developed AKI with oliguria related to shock and critical illness. Medical oncology was consulted and she unfortunately was not a candidate for further chemotherapy at the time due to critical illness, as well as ischemic limb. (If further treatment was pursued, she would need a left leg amputation, then would require 4-6 weeks of recovery before additional chemotherapy could be given.) She slowly became more encephalopathic and had increased oxygen requirements, requiring continuous heated high flow nasal cannula. Goals of care were discussed with her family. Given her advanced cancer, it was decided to transition to comfort-focused care. Her code status was changed to DNRCC. Symptoms were controlled with IV pain and anxiety medication. She expired on 6/13/2021 at 0225.