Pigmented villonodular synovitis (PVNS) - focal

Case contributed by Bahman Rasuli
Diagnosis almost certain


Right knee pain.

Patient Data

Age: 50 years
Gender: Male

Marked joint effusion is seen.

There is an 18 x 28 x 35 mm intra-articular synovial-based soft tissue mass-like lesion at the infrapatellar recess (Hoffa's fat pad) of the right knee joint cavity, expressing T1 hypointense and T2 intermediate to hypointense signals.

Chondromalacia patellae is seen as cartilage thinning and fraying at the medial and lateral facets of the patella.

Anterior cruciate ligament mucoid degeneration is also seen.

Case Discussion

Regarding the imaging findings, focal pigmented villonodular synovitis is the main diagnosis.

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