title: [Intraorbital schwannoma arising from the supraorbital nerve].
abstract: A 67-year-old man presented a three-month history of double vision and slight numbness at his right forehead. Neurological examination on admission demonstrated diplopia at lower gaze and mild hypesthesia at right frontal. MRI disclosed an extraconal cystic mass, centered over the superior rectus muscle, in the superior part of the right orbit. 3D-CT scan in bone window image showed an erosion of the right orbital roof. An operation was performed by a transcranial extradural anterior orbitotomy. It was noticed that the supraorbital nerve entered the cyst wall of the tumor. The mass was dissected from the surrounding intraorbital fat and was removed completely. Pathologically, diagnosis of schwannoma was made. Postoperatively, the diplopia diminished, although numbness at the right forehead remained. Orbital schwannomas constitute 1 to 4% of all orbital tumours. Identification of the nerve of origin of the tumours is difficult. Including this present case, only 11 cases of supraorbital nerve schwannoma, and only three cases of the tumour without neurofibromatosis, have been reported.
authors.affiliation: Department of Neurosurgery, Nagasaki Rosai Hospital, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Izumo
authors.forename: Munehiro
authors.initials: M
authors.lastname: Otsuka
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Okunaga
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Yoshioka
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Yokoyama
authors.forename: Izumi
authors.initials: I
authors.lastname: Nagata
mesh_terms: D000368:Aged; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D009442:Neurilemmoma / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D009882:Ophthalmic Nerve / Q000473:pathology; D009915:Orbit / Q000294:innervation; D009918:Orbital Neoplasms / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D014057:Tomography, X-Ray Computed