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Ⅰ.はじめに
後下小脳動脈(posterior inferior cerebellar artery:PICA)に発生する動脈瘤は全脳動脈瘤の0.5〜3.0%程度で,その多くは椎骨動脈(vertebral artery:VA)-PICA分岐部に発生し,PICA末梢部動脈瘤は全PICA動脈瘤の15〜30%とされ,比較的稀なものと認識されている13,14,21).さらに,頭蓋外に発生したものとなると,文献上散見する程度である.今回われわれは,頭蓋外に発生したPICA末梢部動脈瘤に対して直達術を行い,良好な経過を得た症例を経験したので,文献的考察を加え報告する.
We report a rare case of subarachnoid hemorrhage(SAH)due to ruptured extracranial aneurysm originating at the caudal loop of the left posterior inferior cerebellar artery(PICA). A 50-year-old woman presented with severe headache and mild consciousness disturbance. Computed tomography(CT)revealed SAH and intraventricular hemorrhage. Vertebral angiography showed an extracranial aneurysm located on the tonsillomedullary segment of the left PICA. During the surgery, no vessel branches were confirmed near the aneurysm, and the aneurysm was successfully clipped through suboccipital craniotomy with C1 laminectomy. The patient showed significant recovery and was discharged without neurological deficit.
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