Abstract
Ten aneurysms of the horizontal portion of the anterior cerebral artery (A 1) were analyzed. These 10 aneurysms were classified into three types according to the mode of the origin of the neck of the aneurysm from the A 1 segment: (a) an aneurysm originating from the junction of the A 1 segment and the lenticulostriate artery, (b) one from the proximal end of the fenestration of the A 1 and (c) one from the top of the A 1 loop (elongation and kinking of the A 1 segment). In these aneurysms, their size, the side of the A 1 segment with an aneurysm, the multiplicity of aneurysms, the coexistence of hypertension, the grade of the patients, the laterality of the subarachnoid blood clots (as seen on computed tomography scans) and surgical outcome were analyzed.
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