Abstract
Ganglion cysts are rarely encountered in the temporomandibular joint (TMJ). The etiology remains unclear; however, it may arise from the myxoid degeneration of collagenous tissue of the joint capsule after trauma. We report a case of ganglion cyst in a 66-year-old woman. On physical examination, the patient presented a well-demarcated, mobile, nodular lesion in the right TMJ region. A computed tomography revealed a degenerative change of the right condyle. Magnetic resonance imaging showed a rounded hypodense mass related to temporomandibular articulation. Local excision was performed, and histologic examination showed a multilocular cystic lesion surrounded by a fibrous connective tissue wall without synovial cells. The cells in the lining of the wall were negative for D2-40. Postoperative follow-up revealed no recurrence. The nonspecific clinical presentation and infrequent involvement of ganglion cysts with TMJ make diagnosis a challenge. The definitive diagnosis should be made from results of the histologic examination. Support: FAPEMIG.
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