Abstract
Tumors and tumor-like lesions that involve the temporomandibular joint (TMJ) are very rare and often diagnosed late because of unspecif is or misinterpreted symptoms, which occasionally may lead to extensive expansion of the lesions. Although many reports of TMJ tumors and tumor-like lesions have appeared in the literature, in most of these reports, the bony lesions were either isolated condylar lesions or lesions affecting most of the ascending ramus of mandible.
Two osteolytic lesions extended through the eminence or the glenoid fossa of the temporal bone to the middle cranial f ossa are reported. One was diagnosed as an eosinophilic granuloma arising from the eminence of the temporal bone, and the other was diagnosed as synovial chondromatosis with intracranial extension. We believe that the former is the first case of eosinophilic granuloma arising from the eminence expanded to the middle cranial fossa. Because only 7 cases of intracranial extension of synovial chondromatosis of the TMJ have been previously reported, the latter case may be the eighth case of synovial chondromatosis with intracranial extension. An overview of the current literature and a discussion of the differential diagnosis of the osteolytic lesions extended through the eminence or the glenoid fossa of the temporal bone.
