側頭筋内の遊離骨様組織と筋突起過形成様病変により開口障害を呈した1例 A case of jaw trismus caused by an isolated calcified mass in the temporal muscle and a hyperplasia-like lesion of the mandibular coronoid process
Ectopic calcification involves calcium deposition in soft tissues and can occur in subcutaneous, acromioclavicular joint, and intramyocardial tissues. We describe our experience with a rare case of jaw trismus caused by an isolated calcified mass in the temporal muscle and a hyperplasia-like lesion of the mandibular coronoid process. The patient was a 68-year-old woman. Radiographic examination revealed a hyperplasia-like region in the left mandibular coronoid process and an isolated impermeable mass in the temporal muscle. Coronoidectomy and removal of the isolated mass were performed through an intra-oral approach under general anesthesia. The isolated hard tissue consisted of many tubercles including calcification and cartilage-like tissue. The hyperplasia-like region of the mandibular coronoid process also consisted of calcified tubercles. Cartilage and fibrous bone-like tissue were found in peripheral areas of the calcification at the border of the normal bone. After the coronoidectomy, jaw trismus improved, and no recurrence has occurred.
日本口腔外科学会雑誌 51(11), 547-550, 2005-11-20
Japanese Society of Oral and Maxillofacial Surgeons