Neoplastic disease of the TMJ is a rare condition.
We report a case of Synovial chondromatosis of the right side temporomandibular joint extending to the middle cranial fossa.
We evaluated the cell proliferative activity by immunohistochemical analysis.
Then, we confirmed the growth activity of the lesion and it was thought to be a cause of the tumor expansion.
This is a case report with 7-year postoperative follow up without reoccurrence.