Orthopedic management of a patient with pigmented villonodular synovitis.

Pigmented villonodular synovitis (PVNS), sometimes also called tenosynovial giant cell tumor, is a rare, slow-growing, benign soft-tissue disorder. PVNS most commonly affects the knee and is associated with painful hemarthrosis and joint swelling. The condition also can affect the hip, ankle, shoulder, or elbow. This article reviews practice guidelines for PVNS, diagnosis, and surgical and nonsurgical treatments.