Thoracic aortic aneurysms often grow slowly and usually without symptoms making them difficult to detect some aneurysms will never rupture many start small and stay small although some expand over time how quickly an aortic aneurysm may grow is difficult to predict as a thoracic aortic aneurysm grows some people may notice. 2014 esc guidelines on the diagnosis and treatment of aortic diseases document covering acute and chronic aortic diseases of the thoracic and abdominal aorta of the adult the task force for the diagnosis and treatment of aortic diseases of the european society of cardiology esc. Thoracic aortic aneurysms are most often caused by atherosclerosis a hardening of the arteries that damages the arterys walls while your arteries are normally smooth on the inside as you age they can develop atherosclerosis when atherosclerosis occurs a sticky substance called atheromatous plaque builds up in the walls of the arteries over time excess plaque causes the aorta to stiffen . An aortic dissection starts with a tear in the inner layer of the aortic wall of the thoracic aorta the aortic wall is made up of 3 layers of tissue when a tear occurs in the innermost layer of the aortic wall blood is then channeled into the wall of the aorta separating the layers of tissues this generates a weakening in the aortic wall with a potential for rupture aortic dissection can . A thoracic aortic aneurysm is an aortic aneurysm that presents primarily in the thorax a thoracic aortic aneurysm is the ballooning of the upper aspect of the aorta above the diaphragm untreated or unrecognized they can be fatal due to dissection or popping of the aneurysm leading to nearly instant death thoracic aneurysms are less common than an abdominal aortic aneurysm however a
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