Pigmented villonodular synovitis presenting as a subcutaneous mass at the knee.
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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Department of Radiology, School of Medicine, University of Missouri, Columbia 65212.
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D003937:Diagnosis, Differential; D006801:Humans; D007717:Knee / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012983:Soft Tissue Neoplasms / Q000175:diagnosis* / Q000473:pathology; D013586:Synovitis, Pigmented Villonodular / Q000175:diagnosis* / Q000473:pathology