Ankylosis, between the coronoid process and the zygoma, is a rare occurrence. A review of the literature has disclosed 15 reported cases of this disorder. True incidence of this condition might be even higher. Zygomaticocoronoid ankylosis might have been encountered by many surgeons, and yet it has been misdiagnosed or overlooked.In this article, the treatment of a 14-year-old patient with zygomaticocoronoid ankylosis is presented. With regard to treatment, there are various opinions as to whether the coronoidectomy be performed intraorally or extraorally. In this study, treatment of the patient has been performed via intraoral approach.