2021 Volume 67 Issue 10 Pages 584-589
Synovial chondromatosis usually develops independently, occurring with other diseases very occasionally. Synovial chondromatosis with osteoma, including epiphysis of a long bone, was not previously reported. We describe an extremely rare case. A 47-year-old man was referred to our department due to pain when he opened his mouth and when biting. The lesion was preoperatively diagnosed as a temporomandibular joint tumor on computed tomography (CT) and magnetic resonance imaging (MRI). When the lower joint cavity was opened during surgery, loose bone-like material was discovered, and subsequently removed at the same time as the mandibular condyle tumor. The pathological diagnosis was peripheral osteoma and primary synovial chondromatosis. There has been no recurrence at 1.5 years after surgery.
