Pigmented Villonodular Synovitis: a recurrent case with atypical location and extra-articular extension.

Pigmented Villonodular Synovitis (PVNS) remains a diagnostic challenge because of its non-specific presentation and subtle radiological findings. This uncommon entity is characterized by a benign synovial membrane proliferation of joints, tendon sheaths and bursas. The authors report a case of recurrent PVNS affecting an uncommon location (the first left metatarsophalangeal joint), which extended well beyond the joint margins on recurrence, in a patient with non-specific complaints of joint pain and swelling.