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Posterior Communicating Artery Aneurysm

Last Updated: September 28, 2018

Clip Ligation of an Atherosclerotic Posterior Communicating Artery Aneurysm

Figure 1: Walter Dandy, a pioneer in aneurysm surgery, demonstrated how to expose and control intraoperative aneurysm rupture and place a silver clip across the neck of a posterior communicating artery aneurysm. The aneurysm was subsequently resected.

Aneurysms of the posterior wall of the internal carotid artery (ICA,) originating from the anterior choroidal artery (AChA) and posterior communicating artery (PCoA,) are the most common intracranial aneurysms (up to 35% of all aneurysms.)

PCoA aneurysms represent roughly one-quarter of all ruptured aneurysms. In addition to subarachnoid hemorrhage, patients with PCoA aneurysms commonly present with mass effect on the oculomotor nerve or, less commonly, with em...