title: [A case of cerebral arteriovenous malformation revealing repeated intranidal hemorrhage accompanying neovascularization after stereotactic radiosurgery].
abstract: We report a patient with cerebral arteriovenous malformation (AVM) revealing growing mass lesion after stereotactic radiosurgery. This 12-year-old female presented headache. CT scan showed hematoma at the head of the right caudate nucleus and angiography showed AVM at the site. LINAC-based stereotactic radiosurgery was performed with the patient. Twenty-three months after the radiosurgery the patient complained headache and CT scan showed hematoma again at the same site, although angiography did not show AVM. Thirty-five months after the radiosurgery mass lesion with enhancement effect was observed at the site and the mass lesion grew gradually thereafter. Thirty-nine months after the radiosurgery the mass lesion was evacuated. Histological examination revealed fibrotic core and surrounding neovascularized area with hemorrhage. The histology shows a new etiology of growing mass lesion after radiosurgery for AVM.
authors.affiliation: Department of Neurological Surgery, Nihon University School of Medicine, 30-1 Oyaguchi Kamimachi, Itabashi-ku, Tokyo 173-8610, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Awano
authors.forename: Toshikazu
authors.initials: T
authors.lastname: Kano
authors.forename: Takafumi
authors.initials: T
authors.lastname: Nagaoka
authors.forename: Shigeyoshi
authors.initials: S
authors.lastname: Kimura
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Kano
authors.forename: Goro
authors.initials: G
authors.lastname: Kido
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Katayama
authors.forename: Akio
authors.initials: A
authors.lastname: Kotani
mesh_terms: D001479:Basal Ganglia / Q000098:blood supply; D002533:Cerebral Angiography; D002543:Cerebral Hemorrhage / Q000175:diagnosis* / Q000209:etiology; D002648:Child; D005260:Female; D006406:Hematoma / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D009389:Neovascularization, Pathologic / Q000175:diagnosis* / Q000209:etiology; D011183:Postoperative Complications; D016634:Radiosurgery / Q000009:adverse effects*; D014057:Tomography, X-Ray Computed