Synovial chondromatosis is a rare disease and rarer on temporomandibular joint. Only 51 cases affecting temporomandibular joint were reported in English literature from 1980 to 2000. We report 2 cases of synovial chondromatosis of temporomandibular joint. Case 1 involves a 45-year-old woman presented 10 years history in left temporomandibular joint. Case 2 involves a 70-year-old woman in the same site with 30 years history. Pathological examinations support a diagnosis of synovial chondromatosis. Two of them underwent surgical operation, and good clinical results were gained.
