血管内アプローチにて治療した，前下小脳動脈分枝脈絡叢動脈部破裂動脈瘤の1例

A Ruptured Choroidal Artery Aneurysm of the Anterior Inferior Cerebellar Artery Obliterated via the Endovascular Approach: Case Report

Ⅰ．はじめに

　脳室内出血の中でも，第4脳室内出血は稀にしか遭遇しない^1,4,6,8）．今回，脈絡叢動脈に所在する動脈瘤破裂に起因した第4脳室内出血の1例を経験したので，治療経過を報告すると同時に，今後同様な症例に遭遇した場合の対処指針に示唆を与えるべく，その治療内容をもとに考察を行った．

Intraventricular aneurysms associated with fourth ventricular hemorrhage are rare. A case of a ruptured aneurysm in a choroidal branch of the right anterior inferior cerebellar artery (AICA) is reported here.

A 56-year-old man presented with sudden onset of vertigo and nausea. CT scan showed an intraventricular hemor-rhage within the fourth ventricle. Cerebellar angiography showed an aneurysm at the choroidal artery branching from the right AICA.