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An aneurysm or aneurism (from Greek: á¼Î½ÎµÏÏÏÏÎ¼Î±, aneurysma, dilation, from á¼Î½ÎµÏÏÏÎ½ÎµÎ¹Î½, aneurynein, to dilate) is a localized, blood-filled balloon-like bulge in the wall of a blood vessel.n aneurysm or aneurism (from Greek: á¼Î½ÎµÏÏÏÏÎ¼Î±, aneurysma, dilation, from á¼Î½ÎµÏÏÏÎ½ÎµÎ¹Î½, aneurynein, to dilate) is a localized, blood-filled balloon-like bulge in the wall of a blood vessel.
An aneurysm is a weakening of a blood vessel wall which then forms an outpouching that fills with blood. Aneurysms can form anywhere along an artery's path. In the brain, the most common location for an aneurysm is along the vascular tree at the base of the brain, called the Circle of Willis.he most common types of aneurysms are found in the arteries that connect the two internal carotid arteries: 30% of aneurysms form in the anterior communicating artery (AComm) and 25% form in the posterior communicating artery (PComm).