A Ganglion Cyst of the Temporomandibular Joint

777 Ganglion cyst, although its precise etiology is not determined, is generally considered a degeneration of the mucoid connective tissue, collagen in specific, and was reported for the first time by Ledderhose in 1893 [1]. It is a benign soft-tissue tumor that usually appears near joints such as the hand, wrist, or foot. A ganglion cyst of the temporomandibular joint (TMJ) is a rare disease, and few cases of this condition have been reported in the English language literature. It may develop from a myxoid decay of the collagenous tissue of the TMJ capsule, without an epithelial or endothelial lining. Unconnected with the joint cavity, this cyst arises from the capsule of the joint. The cyst is filled with a gelatinous material and lined with a fibrous connective tissue wall without cells [2]. We present important aspects of the clinical findings, histologic features, and therapeutic options of a rare case of a ganglion cyst of TMJ with a review of the previous articles. A 48-year-old man was admitted at the Department of Head and Neck Surgery at our hospital for an acute spinning type of dizziness lasting a week. An otolaryngologist’s first impression was vestibular neuritis, and magnetic resonance imaging (MRI) was performed for further evaluation. The MRI revealed chronic otomastoiditis and a cystic mass in the left pre-auricular region (Fig. 1). The otolaryngologist prescribed medications for vestibular neuritis. Because unexplored. Despite the uncertainty of the diagnosis, we suggest that pilomatricoma be included in the differential diagnoses of chronic nodular lesions arising at influenza vaccination sites.