The abdominal aortic aneurysm (AAA) occurs due to a weakened wall in the artery. This wall consists of the intima, media, and adventitia layers (Ware-McGee & Marinelli, 2013). As shown in Figure 1, an AAA can develop into various shapes including saccular, fusiform, and pseudoaneurysm. The fusiform and saccular aneurysms are located infrarenally, and are considered true aneurysms because their focal dilation is within the three arterial layers. Pseudoaneurysms on the other hand are considered false aneurysms because the blood dilation is only contained in the adventitia layer or surrounding soft tissue. The fusiform aneurysm is tube-shaped, has no neck, and completely surrounds the aorta. The saccular aneurysm occurs as vascular outpouching
