High blood pressure and high cholesterol increase the risk of atherosclerosis. Additional pressure can cause the arteries to weaken and widen. Plaque buildup on the artery walls causes the arteries to become less flexible. ![]() Hardening of the arteries, called atherosclerosis. ![]() If an aneurysm forms between the upper and lower parts of the aorta, it's called a thoracoabdominal aneurysm.Ī thoracic aneurysm may be round or tube-shaped.Īneurysms can occur anywhere in the thoracic aorta, including near the heart, in the aortic arch and in the lower part of the thoracic aorta.Ĭauses of thoracic aortic aneurysms may include: When an aneurysm occurs in the chest, it's called a thoracic aortic aneurysm. The aorta runs from the heart through the chest and belly area. Call 911 or your local emergency number for immediate help.Īortic aneurysms can develop anywhere in the body's main artery, called the aorta. An aortic dissection or aneurysm rupture is a medical emergency. Most people with aortic aneurysms don't have symptoms unless a dissection or rupture occurs. ![]() Some aneurysms may never rupture or lead to dissection.
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