[Synovial chondromatosis]

Synovial chondromatosis is a rare, mostly benign, and monoarticular disorder of unknown cause, and it is characterized by multiple calcified bodies. It mostly affects the knees, the hips, the elbows, or the shoulders of adult men. The radiographic appearance is characteristic, but the presence of cartilaginous metaplasia on histological examination is conclusive. Excision of the chondral bodies and synovectomy is the treatment of choice and usually gives good results with a low risk of recurrence.