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An aortic aneurysm is enlargement (dilation) of the aorta to greater than 1.5 times normal size. They usually cause no symptoms except when ruptured.〔 Occasionally there may be abdominal, back or leg pain. They are most commonly located in the abdominal aorta, but can also be located in the thoracic aorta. Aortic aneurysms cause weakness in the wall of the aorta and increase the risk of aortic rupture. When rupture occurs, massive internal bleeding results and, unless treated immediately, shock and death can occur. Screening with ultrasound is indicated in those at high risk. Prevention is by decreasing risk factors such as smoking. Treatment is either by open or endovascular surgery. Aortic aneurysms resulted in about 152,000 deaths in 2013, up from 100,000 in 1990. ==Classification== Aortic aneurysms are classified by their location on the aorta. *An aortic root aneurysm, or aneurysm of the sinus of Valsalva. *Thoracic aortic aneurysms are found within the chest; these are further classified as ascending, aortic arch, or descending aneurysms. *Abdominal aortic aneurysms, "AAA" or "Triple A," the most common form of aortic aneurysm, involve that segment of the aorta within the abdominal cavity. Thoracoabdominal aortic aneurysms involve both the thoracic and abdominal aorta. There are other classifications that might help treatment. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aortic aneurysm」の詳細全文を読む スポンサード リンク
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