[Synovial chondromatosis of the temporomandibular joint with invasion into the middle cranial fossa].

Synovial chondromatosis of the temporomandibular joint is a rare occurrence. Resorption of the floor of the skull base caused by the tumour with invasion into the middle cranial fossa has only been described a few times. We report on diagnosis, histologic examination and therapy of a patient with synovial chondromatosis in the articular tubercle of the right temporomandibular joint invading the middle and cranial fossa. After tumour exstirpation the defect in the floor of the middle cranial fossa was reconstructed using a split-skull graft via an intracranial approach.