title: Intraosseous schwannoma originating in inferior alveolar nerve: a case report.
abstract: Schwannomas (neurilemmomas) are benign neoplasms derived from Schwann cells of the neurilemma and appear most frequently on the auditory nerve or peripheral nerves of the skin. They arise in the oral and maxillofacial region infrequently, and very rarely in the center of the jaw. We herein present a case of a rare mandibular intraosseous schwannoma derived from the main trunk of the inferior alveolar nerve in a 33-year-old man. Fusiform expansion in the mandibular canal was observed and a mass showing the target sign in the mandibular canal was confirmed on T2-weighted and Gd contrastenhanced T1-weighted MRI. Based on these findings, an inferior alveolar nerve-derived schwannoma or other benign nervous system neoplasm was diagnosed. A buccal side cortical bone flap in the mandibular molar region was removed to expose the mass, which was then peeled away from the nerve fibers and completely removed. Some inferior alveolar nerve fibers that were connected to the mass were removed at the same time, but the remaining nerve fiber bundle was preserved. Histopathology confirmed the diagnosis of a schwannoma with Antoni type A and Antoni type B regions. Although the patient experienced extremely mild paresthesia in the skin over the mental region and mental foramen at immediately after surgery, this had almost entirely disappeared at 7 years and 4 months later, and there has been no tumor recurrence.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Tokyo Dental College, Masago, Mihama-ku, Chiba, Japan.
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Suga
authors.forename: Satoru
authors.initials: S
authors.lastname: Ogane
authors.forename: Kyotaro
authors.initials: K
authors.lastname: Muramatsu
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Ohata
authors.forename: Takeshi
authors.initials: T
authors.lastname: Uchiyama
authors.forename: Nobuo
authors.initials: N
authors.lastname: Takano
authors.forename: Takahiko
authors.initials: T
authors.lastname: Shibahara
authors.forename: Jun
authors.initials: J
authors.lastname: Eguchi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Murakami
authors.forename: Kenichi
authors.initials: K
authors.lastname: Matsuzaka
mesh_terms: D000328:Adult; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008334:Mandible / Q000473:pathology* / Q000601:surgery; D008339:Mandibular Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008340:Mandibular Nerve / Q000473:pathology*; D009442:Neurilemmoma / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D011859:Radiography