When the large blood vessels that supply blood to the abdomen, pelvis and legs become abnormally large or balloon outward, the condition is called an abdominal aortic aneurysm (AAA). The rupture of an aortic aneurysm is catastrophic for most patients, with only 25 percent of people making it to the hospital in time. Most patients are asymptomatic, which means it is critical for people to undergo screening and be aware of the preventative measures that exist.