小脑后下动脉远端的颅外脑动脉瘤表现为孤立性第四脑室出血：病例报告和文献复习。
Extracranial aneurysm of the distal PICA presenting as isolated fourth ventricular hemorrhage: case report and literature review.
机构信息
Department of Neurosurgery, Sina Hospital, Tehran University of Medical Sciences (TUMS), Tehran, Iran.
出版信息
Acta Neurochir (Wien). 2010 Apr;152(4):699-702. doi: 10.1007/s00701-009-0397-z. Epub 2009 May 26.
BACKGROUND
Posterior inferior cerebellar artery (PICA) aneurysms are relatively uncommon, comprising only 0.5-3% of all intracranial aneurysms. Distal PICA aneurysms are much more uncommon, with more than 200 cases being reported in the literature. The finding of an extracranially located aneurysm of distal PICA is considered a true rarity.
METHODS AND DISCUSSION
A rare case of extracranially located PICA aneurysm presenting with isolated fourth ventricular hemorrhage is presented and the diagnostic and therapeutic challenges discussed.
背景
后下小脑动脉（PICA）动脉瘤相对少见，仅占所有颅内动脉瘤的 0.5-3%。远段 PICA 动脉瘤更为罕见，文献报道超过 200 例。发现远段 PICA 的颅外动脉瘤被认为是真正的罕见病例。
方法与讨论
本文报道了一例罕见的颅外 PICA 动脉瘤病例，表现为孤立性第四脑室出血，并讨论了其诊断和治疗挑战。
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