title: Osteochondroma of the coronoid process of the mandible.
abstract: We describe a rare case of osteochondroma of the coronoid process of mandible accompanied by severe trismus in a 14-year-old Japanese boy. The patient had initially been diagnosed as having internal derangement of the temporomandibular joint (TMJ), and conservative treatment had failed to improve the symptoms. Despite extremely limited TMJ movement, panoramic radiography revealed no abnormality, but magnetic resonance imaging suggested internal derangement of the left TMJ. Five months later, the trismus worsened and computed tomography revealed a bone-like mass confluent with the coronoid process, which was finally diagnosed as osteochondroma. The patient then underwent intra-oral coronoidectomy.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Nihon University School of Dentistry.
authors.forename: Kunihiko
authors.initials: K
authors.lastname: Sawada
authors.forename: Dirk
authors.initials: D
authors.lastname: Schulze
authors.forename: Kunihito
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Shigenori
authors.initials: S
authors.lastname: Hirai
authors.forename: Koji
authors.initials: K
authors.lastname: Hashimoto
authors.forename: Kazuya
authors.initials: K
authors.lastname: Honda
mesh_terms: D000293:Adolescent; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008339:Mandibular Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D015831:Osteochondroma / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D011862:Radiography, Panoramic; D014057:Tomography, X-Ray Computed; D014313:Trismus / Q000150:complications