Significance of Infundibular Dilatation in Unexplained Subarachnoid Hemorrhage

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Abstract
Angiographically equivocal aneurysmal dilatation at the junction of the internal carotid and the posterior communicating arteries was noted in a patient with documented subarachnoid hemorrhage. This was initially thought to be infundibular dilatation. A craniotomy revealed an actual aneurysm. which was obliterated successfully. Whether infundibular dilatation is a preaneurysmal state or a benign dilatation is controversial. The management of angiographically noted infundibular dilatation in cases of “essential” subarachnoid hemorrhage is discussed.

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