Sometimes Atherosclerosis can cause weakening of the arterial walls and as time goes by, this wall can protrude in the attenuated area.

The protruding area is called aneurysm and it is exposed to more hazards than normal areas: rupture because of wall weakness, exertion of pressure on other vessels due to the unnatural protrusion and creation of blood clots in the aneurysm with the dangerous possibility of embolism (a thrombus thrown from the heart to a distant location, where it can cause damage).

Sometimes surgical intervention may be necessary.