Which of the following is the most common cause of aortic aneurysms?

Atherosclerosis is the most common cause of aortic aneurysms, particularly in the abdominal aorta. This degenerative process leads to the formation of plaques within the artery walls, contributing to vascular inflammation, weakening of the vascular wall, and ultimately resulting in the dilation or aneurysm formation. The risk factors associated with atherosclerosis, such as hypertension, hyperlipidemia, smoking, and diabetes, significantly contribute to the incidence of aneurysms.

Genetic disorders may predispose individuals to conditions that can lead to aneurysms, but they are less prevalent compared to atherosclerosis. Trauma can cause acute aortic injuries but does not lead to chronic aneurysm formation, while giant cell arteritis is associated with inflammation of the arteries and can lead to complications, but it is also not a common cause of aortic aneurysms. Overall, atherosclerosis stands out as the primary etiological factor in the majority of cases.