Pigmented Villonodular Synovitis Arising From the Sheath of the Extensor Hallucis Longus in an Eight-Month-Old Infant

Abstract

Pigmented villonodular synovitis (PVS) is a disease of unknown origin that most commonly affects the synovial joints and synovial sheaths of the skeletally mature. In an eight-month-old infant, a leg swelling thought likely to be a sarcoma proved to be PVS on biopsy.