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Paraclinoid Aneurysm

Last Updated: September 28, 2018

Clip Ligation of a Small Ophthalmic Artery Aneurysm

Ophthalmic artery aneurysms arise from the supraclinoid internal carotid artery (ICA), and more specifically, the ophthalmic segment of the supraclinoid ICA. This segment encompasses the ICA from the distal dural ring to the posterior communicating artery.

Ophthalmic segment aneurysms are intradural. They include ophthalmic artery aneurysms, as well as superior hypophyseal aneurysms and their rare variants such as those on the dorsal and ventral surfaces of this ICA segment. The term paraclinoid aneurysm is nonspecific and includes ophthalmic segment aneurysms in addition to transitional or distal cavernous ICA aneurysms on the cavernous or clinoidal segments of the ICA.

Ophthalmic artery aneurysms project superiorly and arise from t...