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A 30-year-old female presents with a painful posterior knee mass. The mass gets larger and more painful with activity. Examination reveals a boggy soft tissue mass about her knee. Radiograph and MRI are shown in Figures A and B. What is the most likely diagnosis?
Pigmented villonodular synovitis (PVNS)
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A 17-year-old male presents to your office with hand swelling and intermittent pain. His pain occurs when his hand is held in a dependent position or when he is swimming. While he was born with a birthmark on his hand, he has noticed it is progressively getting bigger. Clinical photograph, radiographs, and histology are shown. What is the most likely diagnosis?
Giant cell tumor of tendon sheath