Arborescent Lipoma of the Knee (About a Case)

Arborescent lipoma is a rare pseudotumor of the synovium, occurring idiopathically or sometimes in association with mechanical or inflammatory arthropathy. The preferred location is the knee, particularly in the suprapatellar recess. If the diagnosis is evoked, particularly in the presence of a chronic effusion, the diagnosis is based on an MRI examination which shows hypertrophy of the synovial villi which appear to have a fatty signal on all the sequences. However, confirmation of the diagnosis is based on synovial biopsy.