Pigmented villonodular synovitis of the knee: a description of two cases treated in arthroscopy.

The authors present two cases of pigmented villonodular synovitis of the knee. After a discussion of the aspecificity of clinical findings and difficulties in diagnosis based on radiographic evaluation, they conclude that diagnosis may be possible preoperatively by MRI, and that arthroscopic surgery allows for suitable treatment of localized forms of the disease.