Triple abdominal aortic aneurysm

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In an abdominal aortic aneurysm (AAA), the aortic wall is weakened and widening has occurred. An aneurysm is a restricted dilation or out pouching of a vessel wall or cardiac chamber. The dilation produces infarct development, a weak and thin layer of necrotic muscle, and fibrous tissue that bulges with each systole. The aorta is particularly vulnerable to aneurysm formation because of constant stress on the vessel wall and the absence of penetrating vasa vasorum in the media layer. Nearly three-fourths of all aneurysms occur in the abdominal aorta. Aneurysms shape in arteries where there is a disruption of the wall of the vessel associated with changes in collagen and elastin that make the vessel more susceptible to intravascular pressures. Atherosclerosis is the most common cause of arterial aneurysms because plaque formation erodes the vessel wall and contributes to inflammation and release of proteinases that can further weaken the vessel. Hypertension also contributes to aneurysm formation by increasing wall stress. Other infections such as, syphilis and collagen-vascu...

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