Pigmented villonodular synovitis presenting as a subcutaneous mass at the knee.

Cope, R; Apostoles, P S; Pearl, A J; Spollen, L E · J Rheumatol · 1992

case_report · Level V

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Abstract

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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