Nakamura Homare, Tanaka Toshihide, Hiyama Takami, Okubo Shinji, Kudo Tadashi, Kobayashi Hiroo, Odanaka Mieko
Department of Neurosurgery, Ishioka Cardiology and Neurosurgery Hospital, Omitama, Ibaraki, Japan.
Neurol Med Chir (Tokyo). 2010 Jan;50(1):41-4. doi: 10.2176/nmc.50.41.
A 50-year-old man presented with a dissecting aneurysm arising from the extracranial portion of the right posterior inferior cerebellar artery (PICA) causing subarachnoid hemorrhage (SAH) and manifesting as sudden onset of disturbed consciousness. Computed tomography showed SAH with ventricular reflux predominantly in the posterior fossa. Angiography revealed a fusiform aneurysm of the right PICA originating extracranially from the right vertebral artery. The aneurysm was isolated and excised. Histological examination showed dissection of the aneurysm wall. Dissecting aneurysm arising from the extracranial portion of the PICA is extremely rare.
一名50岁男性患者，因右侧小脑后下动脉（PICA）颅外段夹层动脉瘤破裂导致蛛网膜下腔出血（SAH），表现为突发意识障碍。计算机断层扫描显示SAH伴脑室反流，主要位于后颅窝。血管造影显示右侧PICA梭形动脉瘤，起源于颅外右侧椎动脉。动脉瘤被分离并切除。组织学检查显示动脉瘤壁夹层。起源于PICA颅外段的夹层动脉瘤极为罕见。
