Aneurysm of the Posterior Cerebral Artery with Unexpected Postoperative Neurological Deficit

Case Report

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Congenital intracranial aneurysms of the posterior cerebral artery trunk are rare. We have seen but one case in our series of more than 300 aneurysms. The Cooperative Study of Intracranial Aneurysms and Subarachnoid Hemorrhage has reported seven single posterior cerebral main-trunk aneurysms in 2,672 single aneurysm cases,3 an occurrence of 0.26%. We know of no reports of obliterating such aneurysms by trapping.

This is the report of an aneurysm of the posterior cerebral artery trunk that was treated successfully by obliterating the parent vessel with very little permanent neurological deficit.

<bold>Anatomy</bold>

Normally, the posterior cerebral arteries

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    Left transaxillary, right retrograde vertebral arteriograms demonstrating right main trunk posterior cerebral artery aneurysm.

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    Postoperative vertebral arteriograms showing non-filling of the aneurysm sac. Although it cannot be seen in the photograph, contrast media appeared in the distribution of the medial posterior choroidal artery.

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