How is an abdominal aortic aneurysm formed?

Abdominal aortic aneurysm (AAA) is formed due to localized dilation and expansion of the abdominal aorta caused by weakness or defects in the aortic wall. The details are as follows:

The aorta is one of the largest and most important arteries in the body, responsible for delivering blood from the heart to various parts of the body. The aortic wall consists of three layers: the intima, the media, and the adventitia. The intima is a single layer of cells lining the inner surface of the aorta; the media, which constitutes the main component of the aortic wall, contains smooth muscle fibers and elastic fibers; and the adventitia is a connective tissue layer that connects the aorta to surrounding tissues. Aneurysm formation occurs when defects or damage develop in the aortic wall, weakening its ability to withstand high blood pressure, leading to gradual bulging and aneurysm formation. Such defects or injuries to the aortic wall may result from multiple factors, including hypertension and atherosclerosis. Hypertension and atherosclerosis are the most common causes of abdominal aortic aneurysms. In addition, certain genetic factors, smoking, and excessive alcohol consumption may also increase the risk of developing AAA.

Abdominal aortic aneurysms are more commonly found in older individuals, and the incidence is higher in men than in women. Individuals who identify themselves as having related risk factors should undergo regular abdominal ultrasound examinations to enable early detection and treatment of abdominal aortic aneurysms.