An aneurysm is an abnormal swelling of a weakened part of an artery or blood vessel. If left untreated, the aneurysm may enlarge and stretch the walls of the artery or blood vessel to the point of rupture. This, in turn can cause internal bleeding and sudden death.
Aneurysms can occur in any artery, but rupture of aneurysms in the aorta or brain are usually fatal.
