What is the definition of an abdominal aortic aneurysm (AAA)?

An abdominal aortic aneurysm (AAA) is accurately defined as an abnormal enlargement of the aorta that supplies blood to the abdomen, pelvis, and legs. This condition occurs when a section of the aorta, which is the major artery carrying blood from the heart to the rest of the body, becomes weakened and expands. The enlargement can lead to a significant risk of rupture, which is a medical emergency that can result in life-threatening bleeding.

This definition highlights the critical nature of the condition—the aorta's integrity is compromised, impacting blood flow and posing severe health risks. Understanding AAA is essential for recognizing symptoms, diagnosing the condition, and timely intervention to prevent complications.

The other definitions do not accurately describe AAA, focusing instead on different vascular conditions, which aids in clarifying the specific nature of an abdominal aortic aneurysm.