Pigmented villonodular synovitis in both hindfeet

Description: Pigmented villonodular synovitis (PVNS) is a proliferation of the syn- ovium that leads to villous or nodular changes of synovial-lined joints, bursae and tendon sheaths.1 It is rare and likely caused by either an inflammatory response or neoplastic formation of the synovium. Both the extra- and the intra-articular types appear in a nodular-localized and villous- diffuse variant. It usually affects single joints only, and bilateral involvement is extremely rare.
Krause et al Can J Surg, Vol. 52, No. 2, April 2009 E37