An Aneurysm (AN-u-rism) is a balloon-like bulge in the wall of an artery or the heart muscle. This bulge can occur if the artery wall weakens. Pressure from blood moving through the artery or heart causes the weak area to bulge.
Over time, an aneurysm can grow and burst, causing dangerous, often fatal bleeding inside the body. Aneurysms also can develop a split in one or more layers of the artery wall. The split causes bleeding into and along the layers of the artery wall.
Aneurysms in the heart most often occur in the heart’s lower left chamber (the left ventricle). Repairing an aneurysm involves surgery to replace the weak section of the artery or heart wall with a patch or graft.