title: Dissecting aneurysm associated with a double origin of the posterior inferior cerebellar artery causing subarachnoid hemorrhage.
abstract: Two cases of the posterior fossa dissecting aneurysm associated with a double origin of the posterior inferior cerebellar artery (DOPICA) causing subarachnoid hemorrhage are presented. After observing a relationship between the aneurysm and DOPICA on a three dimensional rotational angiogram (3DRA), the dissecting aneurysms were successfully obliterated by surgical trapping and endovascular internal trapping, respectively. This report warrants suspecting DOPICA of an associating anomaly predisposing to dissecting aneurysm in the vertebral artery-posterior inferior cerebellar artery territory and highlights the role of 3DRA in pretreatment evaluation of unusual aneurysms accompanying a particular anatomical variation.
authors.affiliation: Department of Neurosurgery, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
authors.forename: Jun Seok
authors.initials: JS
authors.lastname: Koh
authors.forename: Cheol Young
authors.initials: CY
authors.lastname: Lee
authors.forename: Seung Hwan
authors.initials: SH
authors.lastname: Lee
authors.forename: Gook Ki
authors.initials: GK
authors.lastname: Kim