Abstract
In spite of the belief that pericallosal bifurcation is the predilectional site for aneurysm, only a few reports have so far been available. Since 1963 nine cases of such aneurysms have been encountered at the Yamaguchi University Hospital. All aneurysms located on so-called pericallosal bifurcation at the genu of the corpus callosum. Seven aneurysms were saccular and two were fusiform. Multiple aneurysms were found in one case, while another case had a combined arteriovenous malformation at the periphery of the aneurysm. In one case, the internal carotid artery on the opposite side was occluded.
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