title: Ruptured pseudoaneurysm following Gamma Knife surgery for a vestibular schwannoma.
abstract: A 75-year-old woman underwent Gamma Knife surgery (GKS) for a vestibular schwannoma. Eight years after GKS, she suffered sudden onset of headache. Computed tomography revealed diffuse subarachnoid hemorrhage around the cisterns of the posterior fossa. Right vertebral artery angiography showed an aneurysm arising from the lateral pontomedullary segment of the left anterior inferior cerebellar artery. The aneurysm was not located at a branching site. Trapping of the distal anterior inferior cerebellar artery aneurysm was performed, and the aneurysm was removed. The pathological features of this aneurysm are discussed. This aneurysm was diagnosed as a pseudoaneurysm pathologically. This is the first report of aneurysm formation with pathological findings following GKS for a vestibular schwannoma.
authors.affiliation: Departments of Neurosurgery, Iwate Prefecture Central Hospital, Morioka City, Iwate, Japan. redpine7219@hotmail.co.jp
authors.forename: Yousuke
authors.initials: Y
authors.lastname: Akamatsu
authors.forename: Takayuki
authors.initials: T
authors.lastname: Sugawara
authors.forename: Shigeki
authors.initials: S
authors.lastname: Mikawa
authors.forename: Atsushi
authors.initials: A
authors.lastname: Saito
authors.forename: Sadafumi
authors.initials: S
authors.lastname: Ono
authors.forename: Kazuo
authors.initials: K
authors.lastname: Takayama
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Jokura
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Seki
mesh_terms: D000368:Aged; D017541:Aneurysm, False / Q000209:etiology*; D017542:Aneurysm, Ruptured / Q000209:etiology*; D005260:Female; D006801:Humans; D009464:Neuroma, Acoustic / Q000601:surgery*; D011183:Postoperative Complications; D016634:Radiosurgery / Q000009:adverse effects*