Most common location of abdominal aortic aneurysm?

Most common location of abdominal aortic aneurysm?

• A. Above renal arteries
• B. Below renal arteries, above bifurcation
• C. At the aortic arch
• D. Infrarenal segment

Answer: (B)

Most abdominal aortic aneurysms form in the infrarenal portion of the aorta—the segment below the renal arteries and before the aorta splits into the iliac arteries. This area is particularly prone to wall weakening from atherosclerotic degeneration of the media, making it the common site for dilation. Saying the aneurysm is “below the renal arteries, above the bifurcation” pins down the infrarenal region with two clear landmarks, which is precisely why that description is the best match. The other locations (above the kidneys or at the arch) are not typical sites for abdominal aneurysms, while infrarenal and the boundary description essentially describe the same region.

Most abdominal aortic aneurysms form in the infrarenal portion of the aorta—the segment below the renal arteries and before the aorta splits into the iliac arteries. This area is particularly prone to wall weakening from atherosclerotic degeneration of the media, making it the common site for dilation. Saying the aneurysm is “below the renal arteries, above the bifurcation” pins down the infrarenal region with two clear landmarks, which is precisely why that description is the best match. The other locations (above the kidneys or at the arch) are not typical sites for abdominal aneurysms, while infrarenal and the boundary description essentially describe the same region.