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Popliteal Cyst

History
A patient presents with pain at the back of the knee.

Findings
There is a large posterior popliteal fluid collection. Marked tri-compartmental degenerative change in the medial joint compartment is also seen. These latter changes are in keeping with secondary avascular necrosis. Also present is a large joint effusion with marked synovitis and synovial hypertrophy.

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