Where do the majority of aortic aneurysms occur?

The majority of aortic aneurysms occur in the abdominal area, specifically in the infrarenal portion of the abdominal aorta. This is largely due to a combination of factors, including the prevalence of atherosclerosis, which tends to impact the abdominal aorta more significantly than other segments of the aorta. The abdominal aorta is subject to increased hemodynamic stress and is a common site for weak points to develop in the vessel wall, leading to aneurysm formation.

In contrast, while thoracic aortic aneurysms do occur, they are less common than abdominal ones. The cranial and pelvic regions are not typical sites for aneurysm development within the aorta. Thus, the abdominal region is recognized as the primary location for the majority of aortic aneurysms, reflecting its anatomical and pathological features.