An unusual condition of the lining inside the knee joint, where the synovial cells are abnormal - proliferating into both villi (fronds) and nodules, laden with a brown pigment.
The cause is unknown. Usually only one of the knees is affeced. Typically the joint gradually becomes swollen and uncomfortable, with the swelling out of proportion to the pain. The affected synovium may be localised or generalised.
Treatment is synovectomy.
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