The word "aneurysm" comes from the Greek word aneurysma (ana, meaning across, and eurys, meaning broad) and denotes an abnormal dilatation of an artery. Cerebral aneurysms involve both the anterior circulation and the posterior, or vertebrobasilar, circulation. Anterior circulation aneurysms arise from the internal carotid artery or any of its branches, whereas posterior circulation aneurysms arise from the vertebral artery, basilar artery, or any of their branches. An internal carotid artery aneurysm is shown in the image below.
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