DefinitionAn aneurysm is a weak area in the wall of a blood vessel that causes the blood vessel to bulge or balloon out. It can leak blood and cause a stroke or bleeding along the surface of the brain (also called a subarachnoid hemorrhage).See also: Aneurysm in the brainAlternative NamesAneurysm repair - cerebral; Cerebral aneurysm repair; Coiling; Saccular aneurysm repair; Berry aneurysm repair; Fusiform aneurysm repair; Dissecting aneurysm repair; Endovascular aneurysm repair - brainDescriptionYour doctor will decide the best way to perform surgery on your aneurysm. Endovascular repair, most often using a "coil" or coiling, is a less invasive way to treat some aneurysms.During endovascular repair of an aneurysm, your surgeon blocks off the aneurysm before it can break open (ruptures).It