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Case Reports
Pigmented Villonodular Synovitis Presenting as a Baker Cyst
Am J Orthop. 2011 October;40(10):528-531
Author and Disclosure Information
Rick Tosti, MD, and John D. Kelly IV, MD
Pigmented villonodular synovitis (PVNS), a rare hyper-proliferation of the synovial lining, commonly mimics other conditions. As a result, the diagnosis may remain elusive, as the classic signs of tenderness and effusion are not specific. Occasionally, PVNS presents as a popliteal cyst, which may divert attention from intra-articular pathology.
In this article, we describe a case of PVNS that presented with a popliteal cyst as the chief problem report. In other cases PVNS presented as a popliteal cyst, and evidence was reported of PVNS within the cyst stalk and presumable intra-articular involvement. Our case did not present this way.
We recommend that the diagnosis of PVNS be considered in young adults who present with a popliteal cyst.