A case in which a microaneurysm arising in an infundibular dilatation was considered a rupture site

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  • Infundibular dilatation部に発生した微小脳動脈瘤が破裂部位と考えられた１例
  • Infundibular dilatationブ ニ ハッセイ シタ ビショウノウ ドウミャクリュウ ガ ハレツ ブイ ト カンガエラレタ 1レイ

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<p>  Infundibular dilatation (ID) is a dilatation of ＜ 3 mm at the bifurcation between the internal carotid artery and the posterior communicating artery (PcomA), from the tip of which the PcomA branches. ID is considered anatomically normal and is a dilation without pathological significance. However, there have been reports of rupture of the ID itself or the rupture of a cerebral aneurysm arising from ID. We report the case of a rupture of a microaneurysm arising from ID. A 69‒year‒old Japanese woman came to our hospital with the sudden onset of headache and disturbance of consciousness. Head CT showed a diffuse, thick subarachnoid hemorrhage. Digital subtraction angiography (DSA) performed on Day 0 showed a microaneurysm arising from ID. On Day 3, DSA revealed a change in the shape of the microaneurysm and its enlargement. We performed stent‒assisted coil embolization. The patient had a good postoperative course. We also provide a literature review of cases of microaneurysms arising from ID.</p>

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