title: Osteochondroma of the coronoid process (Jacob's disease): an unusual cause of restricted jaw motion.
abstract: Osteochondromas are the most common benign bone tumor, most commonly found in the ends of long bones; however, they rarely involve facial bones, particularly the mandible. Osteochondromas involving the coronoid process have rarely been reported in the literature but pose a diagnostic dilemma. When large enough, osteochondromas of the mandibular coronoid process can form a joint with the zygomatic arch (Jacob's disease). This pseudoarticulation results in restricted jaw motion, which can clinically be mistaken for temporomandibular joint dysfunction. We report a case of a 39-year-old man with chronic restricted jaw motion undiagnosed for several years.
authors.affiliation: Department of Radiology, Crouse Hospital, Syracuse, NY, USA. dambrosn@hotmail.com
authors.forename: Nicholas
authors.initials: N
authors.lastname: D'Ambrosio
authors.forename: Robert M
authors.initials: RM
authors.lastname: Kellman
authors.forename: Sasan
authors.initials: S
authors.lastname: Karimi
mesh_terms: D000328:Adult; D006801:Humans; D007573:Jaw Neoplasms / Q000175:diagnosis* / Q000503:physiopathology / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D015831:Osteochondroma / Q000175:diagnosis* / Q000503:physiopathology / Q000601:surgery; D016059:Range of Motion, Articular; D014057:Tomography, X-Ray Computed