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Pigmented villonodular synovitis (PVNS)

Case contributed by Frank Gaillard
Diagnosis almost certain

Hyperdense expansion of the joint capsule with bony erosions. 

Nodular hypertrophy of the knee synovium with low signal on both T1 and T2 weighted sequences, consistent with pigmented villonodular synovitis. Note the erosions of the adjacent bones. 

Case Discussion

Case courtesy of Bob Cook, MD. Western Memorial Regional Hospital Corner Brook, Newfoundland.

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