gene4648,
Aortic enlargements can be hereditary or caused by injury, infection or a congenital weakness in the connective tissue of the artery wall. Cigarette smoking, high blood pressure, or clogging and hardening of the arteries can make the condition worse. If the enlargement is greater than 5 cm, surgical repair is indicated
in order to prevent a rare but fatal condition called aortic dissection or
rupture. You can read more here
http://www.csmc.edu/printerfriendly.asp?pageid=3866
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