Where do the majority of abdominal aortic aneurysms (AAAs) typically occur?

Abdominal aortic aneurysms (AAAs) most commonly occur in the infrarenal region, which is situated below the renal arteries. This location is significant because the infrarenal segment of the aorta is the most prevalent area for aneurysmal dilation. Factors contributing to this prevalence include the relative anatomical position and hemodynamic stress placed on this section of the aorta over time.

The infrarenal area is also less supported by surrounding structures compared to other segments, making it more vulnerable to changes caused by risk factors such as hypertension, atherosclerosis, and genetic predispositions. Identifying AAAs in this region is critical, as they can pose life-threatening risks when they rupture. Therefore, understanding that the majority of AAAs occur infrarenally is essential for proper diagnosis and management in critical care settings.