Chondroid tenosynovial giant cell tumor of the temporomandibular joint presenting as a deep-lobe parotid tumor

Abstract

Tenosynovial giant cell tumor (TGCT) is a rare benign craniofacial soft-tissue tumor characterized by overgrowth of the synovial tissue, tendon sheath, bursa, and joint structure. It is classified into two types, diffuse and localized TGCT, and has rarely been reported in the temporomandibular joint. The etiology of TGCT is unknown, and the management of TGCT varies depending on the tumor location and treatment-related morbidity. Here, we describe the case of a 47-year-old man who presented with a complaint of a right parotid mass that had slowly increased over 2 months and was associated with ear fullness. Initially, the lesion was painless, but pain during chewing without any limitation of the jaw movement developed subsequently. The patient was diagnosed with diffuse TGCT with chondroid metaplasia.