Intraosseous ganglion of the temporomandibular joint presenting with otorrhea

A ganglion cyst of the temporomandibular joint is a rare entity that common ly presents as a minimally tender, preauricular mass. This benign cystic le sion, which is lined by synovium and can be found in association with other joints, occasionally erodes adjacent bone to form an intraosseous ganglion . We discuss an unusual case of an intraosseous temporomandibular ganglion cyst that presented with bloody otorrhea. Examination revealed an external auditory canal mass with radiographic evidence of temporal bone erosion. Th e cyst was excised using a combined approach to the glenoid fossa and masto id. The management principals of this case and a pertinent review of the li terature are included.