title: Arteriovenous malformation of the vestibulocochlear nerve.
abstract: We describe a rare case of an arteriovenous malformation (AVM) embedded in the vestibulocochlear nerve presenting with subarachnoid hemorrhage (SAH) treated by microsurgical elimination of the main feeding artery and partial nidus volume reduction with no permanent deficits. This 70-year-old woman was incidentally diagnosed 4 years previously with two small unruptured tandem aneurysms (ANs) on the right anterior inferior cerebral artery feeding a small right cerebellopontine angle AVM. The patient was followed conservatively until she developed sudden headache, nausea and vomiting and presented to our outpatient clinic after several days. Magnetic resonance imaging demonstrated findings suggestive of early subacute SAH in the quadrigeminal cistern. A microsurgical flow reduction technique via clipping between the two ANs and partial electrocoagulation of the nidus buried within the eighth cranial nerve provided radiographical devascularization of the ANs with residual AVM shunt flow and no major deficits during the 2.5 year follow-up. This is only the second report of an auditory nerve AVM. In the event of recurrence, reoperation or application of alternative therapies may be considered.
authors.affiliation: Adam Tucker, Masao Tsuji, Yoshitaka Yamada, Kenichiro Hanabusa, Tohru Ukita, Hiroji Miyake, Takehisa Ohmura, Department of Neurosurgery, Nishinomiya Kyoritsu Neurosurgical Hospital, Nishinomiya, Hyogo 663-8211, Japan.
authors.forename: Adam
authors.initials: A
authors.lastname: Tucker
authors.affiliation: Adam Tucker, Masao Tsuji, Yoshitaka Yamada, Kenichiro Hanabusa, Tohru Ukita, Hiroji Miyake, Takehisa Ohmura, Department of Neurosurgery, Nishinomiya Kyoritsu Neurosurgical Hospital, Nishinomiya, Hyogo 663-8211, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Tsuji
authors.affiliation: Adam Tucker, Masao Tsuji, Yoshitaka Yamada, Kenichiro Hanabusa, Tohru Ukita, Hiroji Miyake, Takehisa Ohmura, Department of Neurosurgery, Nishinomiya Kyoritsu Neurosurgical Hospital, Nishinomiya, Hyogo 663-8211, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Yamada
authors.affiliation: Adam Tucker, Masao Tsuji, Yoshitaka Yamada, Kenichiro Hanabusa, Tohru Ukita, Hiroji Miyake, Takehisa Ohmura, Department of Neurosurgery, Nishinomiya Kyoritsu Neurosurgical Hospital, Nishinomiya, Hyogo 663-8211, Japan.
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Hanabusa
authors.affiliation: Adam Tucker, Masao Tsuji, Yoshitaka Yamada, Kenichiro Hanabusa, Tohru Ukita, Hiroji Miyake, Takehisa Ohmura, Department of Neurosurgery, Nishinomiya Kyoritsu Neurosurgical Hospital, Nishinomiya, Hyogo 663-8211, Japan.
authors.forename: Tohru
authors.initials: T
authors.lastname: Ukita
authors.affiliation: Adam Tucker, Masao Tsuji, Yoshitaka Yamada, Kenichiro Hanabusa, Tohru Ukita, Hiroji Miyake, Takehisa Ohmura, Department of Neurosurgery, Nishinomiya Kyoritsu Neurosurgical Hospital, Nishinomiya, Hyogo 663-8211, Japan.
authors.forename: Hiroji
authors.initials: H
authors.lastname: Miyake
authors.affiliation: Adam Tucker, Masao Tsuji, Yoshitaka Yamada, Kenichiro Hanabusa, Tohru Ukita, Hiroji Miyake, Takehisa Ohmura, Department of Neurosurgery, Nishinomiya Kyoritsu Neurosurgical Hospital, Nishinomiya, Hyogo 663-8211, Japan.
authors.forename: Takehisa
authors.initials: T
authors.lastname: Ohmura
keywords: Arteriovenous malformation; Flow reduction; Microsurgery; Subarachnoid hemorrhage; Vestibulocochlear nerve