Pigmented villonodular synovitis presenting as a subcutaneous mass at the knee

R Cope, P S Apostoles, A J Pearl, L E Spollen
Journal of Rheumatology 1992, 19 (2): 319-21
We describe a 45-year-old man who developed a painful mass about his knee. Magnetic resonance imaging demonstrated a well defined lesion, and biopsy confirmed a diagnosis of pigmented villonodular synovitis. Our case exemplifies a primary synovial process presenting as a subcutaneous tumor. Such diagnostic possibilities, although rare, should be more widely known.

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