title: Juxtacortical osteoma of the ulna.
abstract: Acase of juxtacortical osteoma of the ulna in a 47-year-old woman is presented. She had a dense bony mass on the ulna. Radiological examinations (plain radiography, computed tomography, magnetic resonance imaging) strongly suggested a rare case of juxtacortical osteoma of a long tubular bone. The differential diagnosis included parosteal osteosarcoma, melorheostosis, osteochondroma, end-stage juxtacortical myositis ossificans, and fibrous dysplasia protuberans. The tumor was excised totally for thorough pathological examination, which revealed it to be composed of lamellar bone, suggesting that the origin was periosteal.
authors.affiliation: Department of Orthopaedic Surgery, Faculty of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Chikuda
authors.forename: Takahiro
authors.initials: T
authors.lastname: Goto
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Ishida
authors.forename: Takuo
authors.initials: T
authors.lastname: Iijima
authors.forename: Kozo
authors.initials: K
authors.lastname: Nakamura
mesh_terms: D001707:Biopsy, Needle; D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery*; D003937:Diagnosis, Differential; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007150:Immunohistochemistry; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D010016:Osteoma / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D018217:Osteosarcoma, Juxtacortical / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery*; D018570:Risk Assessment; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014457:Ulna