Abstract
Tenosynovial giant-cell tumors are classified into diffuse and localized types. The diffuse type develops primarily in major joints and rarely in the temporomandibular joint. We report a diffuse-type tenosynovial giant-cell tumor that developed in the temporomandibular joint, along with a discussion of the literature. A 27-year-old woman visited our hospital because of pain in the right temporomandibular joint and difficulty in mouth opening as chief complaints. Radiological examination showed a lesion in the right side of the temporomandibular joint. The histopathological diagnosis on biopsy was a tenosynovial giant-cell tumor of the diffuse type, and we performed tumor excision with the patient under general anesthesia. There has been no evidence of recurrence as of 3 years 2 months after the operation. However, continuous strict follow-up is needed in consideration of the high recurrence rates.
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