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Abstract

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Most intracranial saccular aneurysm arise from distal angle between a parent vessel
and an arterial branch. We present three cases of saccular aneuysems arising from the
unbranched-site of the dorsal wall of the intracranial internal carotid artery(ICA) total of
162 ICA aneurysms(1.9%). All three cases presented with sudden onset of headache and
mental deterioration. Computerized tomography(CT) scans revealed typical pattern of
aneurysmal subarachnoid hemmorrhage. With transfemoral cerebral angiograph(TFCA)
dorsal wall aneurysms were easily detected except one case, which we missed small
bulging at unusual site initial TFCA. Second TFCA of this particular case a difinite
aneurysmal dilatation at dorsal wall of intracranial ICA. The operative findings disclosed
darkish red entirely thin-walled aneurysms pointing to the sylvian cistern. attached to
either temporal lobe or optic nerve. in two cases aneurysms were ruptured during neck
dissection. The authors emphasize the pathogenesis and surgical points of particular type
of aneurysm with review if patient literatures.

Å°¿öµå

Dorsal wall aneurysm; Unbranched-site; internal carotid artery;

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