Pigmented villonodular synovitis of Hoffa's fat pad

Case contributed by Dr Roberto Schubert


Moderately tender mass near the patellar tendon.

Patient Data

Age: 40 years
Gender: Female

Intermediate signal intensity mass with signal void rim (arrow) due to hemosiderin deposits. It shows muscle isointense signal on T1-weighted images and moderate enhancement after contrast injection.

Case Discussion

Circumscribed 5 mm mass in Hoffa's fat pad with peripheral signal voids due to susceptibility artifacts caused by hemosiderin deposits. The lesion was surgically excised. Histopathologic diagnosis: pigmented villonodular synovitis (PVNS).

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Case information

rID: 13855
Published: 24th May 2011
Last edited: 23rd Dec 2019
Inclusion in quiz mode: Excluded

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