Understanding AAA Measurements: Diameter and Length Explained

An abdominal aortic aneurysm (AAA) is a bulging of the aorta, the largest artery in the body, as it passes through the abdomen. It is typically measured in two dimensions: the diameter and the length.

The diameter of an AAA is measured in centimeters (cm). It is the distance across the widest part of the aneurysm. The length of an AAA is also measured in centimeters. It is the distance from the proximal (upper) end of the aneurysm to the distal (lower) end.

The diameter and length of an AAA are important factors in determining the risk of rupture. The larger the aneurysm, the greater the risk of rupture. The location of the aneurysm is also important. AAAs that are located near the kidneys or other organs are more likely to rupture than those that are located in the mid-abdomen.

Knowing the diameter and length of an AAA can help doctors to determine the best course of treatment. Treatment options for AAA include watchful waiting, endovascular aneurysm repair (EVAR), and open surgical repair.