Anterior Choroidal Artery Aneurysm Associated With Moyamoya Disease

Syunsuke Seki, Tomoya Kamide, Akira Tamase, Kentaro Mori, Yu Iida, Yuichi Kawabata, Tatsu Nakano, Motohiro Nomura


The clinical course and management of anterior choroidal artery (AChoA) aneurysms associated with moyamoya disease (MMD) have not been fully clarified. A 61-year-old man experienced dysarthria. CT revealed hemorrhage in the lateral ventricles, and an aneurysm in the left lateral ventricle. MRI performed 13 months prior to the onset showed no aneurysm. Angiography on admission demonstrated an aneurysm of about 4 mm in diameter on the left anterior choroidal artery. Repeated angiography on the ninth day showed enlargement of the aneurysm. However, MRI and angiography demonstrated the disappearance of the aneurysm on the 17th day. On the 38th day, superficial temporal artery-middle cerebral artery bypass was performed to decrease the hemodynamic stress on the distal arteries. Follow-up angiography showed no recurrence of the aneurysm. This is the first reported case of a distal anterior choroidal artery aneurysm, which was previously undetectable, showing enlargement followed by spontaneous disappearance. Distal aneurysms associated with MMD occasionally regress. Therefore, close radiological observation is necessary.

J Neurol Res. 2016;6(1):24-27


Aneurysm; Anterior choroidal artery; Moyamoya disease; Intraventricular hemorrhage

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