Pigmented villonodular synovitis presenting as a subcutaneous mass at the knee
Cope, R.; Apostoles, P.S.; Pearl, A.J.; Spollen, L.E.
Journal of Rheumatology 19(2): 319-321
1992
ISSN/ISBN: 0315-162X PMID: 1629838 Document Number: 389345
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.