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A 34-year-old male with an eleven-year history of hand exposure to polyvinyl chloride presents with hand pain, but no constitutional symptoms. Physical exam shows lesions involving the nail-folds of the thumb, long, and ring finger as well as several soft-tissue masses in the palm. A radiograph is shown in Figure A and an axial T2 MRI is shown in Figure B. Angiography shows diffuse involvement of multiple lesions in the hand. A CT scan of the chest shows metastasis to the lungs. He undergoes an open biopsy and a representative histology image is shown in Figure C. The biopsy specimen stains positive for CD31 endothelial marker. What is the most likely diagnosis?
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