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Australian New Zealand Clinical Trials Registry: ACTRN12608000623392.

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ONGENITAL intracranial aneurysms of the posterior cerebral artery trunk are rare. We have seen but one case in our series of iuore than 300 aneurysms. The Cooperative Study of lntracranial Aneurysms and Subarachnoid Hemorrhage has reported seven single posterior cerebral maintrunk aneurysms in I~,67i single aneurysm cases, 3 an occurrence of 0.i6%. 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.