An aneurysm is an abnormal, localized dilatation – or bulge – of a blood vessel, which results from weakening of the vessel wall. The thin and weakened vessel wall is at increased risk of ...

Typically an aneurysm occurs when a part of the wall of an artery (a type of blood vessel) becomes stretched and bulges out. You can get an aneurysm in any blood vessel, but they are most common ...