What is the most common location for a true aneurysm?

The most common location for a true aneurysm is in the infrarenal aorta. This designation refers to the segment of the aorta that is located below the renal arteries, and it is where a majority of abdominal aortic aneurysms develop. Factors contributing to this prevalence include a combination of anatomical, hemodynamic, and pathophysiological conditions that favor the development of aneurysms in this area, such as the presence of atherosclerotic disease.

Moreover, the infrarenal region is often subject to pulsatile stress and turbulence caused by blood flow, particularly at the bifurcation points of major branches. These conditions can weaken the vessel wall over time, leading to dilation and aneurysm formation.

In contrast, the suprarenal region is less commonly affected due to its proximity to the more rigid thoracic aorta and the supportive structures around the renal arteries. Thoracic aneurysms, while significant, are less frequent than abdominal ones. The term "extrarenal" typically pertains to areas outside of the renal vasculature and does not refer to a specific common site for true aneurysms within the aorta itself. Thus, the infrarenal aorta's higher incidence is well-supported in clinical practice