In a typical one, the tunica intima and tunica media have ruptured, leaving the tunica adventitia as the only containment.  
In a typical one, the tunica intima and tunica media have ruptured, leaving the tunica adventitia as the only containment.  A pulsating enlargment behind the knee is cause by one occurring in the politeal artery, however the aorta is even more prone to them.  For ten points, name this bulge usually found in the walls of diseased blood vessels.
In a typical one, the tunica intima and tunica media have ruptured, leaving the tunica adventitia as the only containment.  
aneurysm