Aneurysm of the Posterior Communicating Artery Itself

Two cases of saccular aneurysms arising from the posterior communicating artery itself are presented. They account for 0.5% of the 409 intracranial aneurysms we have treated. Classification of so-called posterior communicating artery aneurysms and the incidence of aneurysms arising from the posterior communicating artery itself are reviewed, and the surgical significance of this aneurysm is briefly discussed.