BACKGROUND Intracranial dissecting aneurysms are relatively rare. We presen
t a rare case of a dissecting aneurysm originating from the anterior choroi
dal artery; this is the first reported case.
CASE DESCRIPTION A 42-year-old man suffered sudden onset of right hemipares
is and dysarthria. Computed tomography on admission revealed a small low de
nsity area in the posterior limb of the internal capsule. MR imaging reveal
ed aneurysmal dilatation of the anterior choroidal artery, and angiography
revealed aneurysmal dilatation and stasis of dye in the venous phase at the
anterior choroidal artery, which resolved in the chronic stage.
CONCLUSION We describe a rare case of a dissecting aneurysm of the anterior
choroidal artery. The radiological findings were characteristic of dissect
ing aneurysms in spite of the rare location. (C) 2000 by Elsevier Science I