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・ Thordarhyrna
・ Thordenskjold Township, Barnes County, North Dakota
・ Thordher
・ Thordher (Old name Said Ghani Kalae)
・ Thordis Brandt
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・ Thoracic aorta
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Thoracic aortic aneurysm
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Thoracic aortic aneurysm : ウィキペディア英語版
Thoracic aortic aneurysm

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 syphilitic aneurysm is more likely to be a thoracic aortic aneurysm than an abdominal aortic aneurysm.
==Causes==
There are a number of causes, Aneurysms in patients younger than 40 usually involve the ascending aorta due to a weakening of the aortic wall associated with connective tissue disorders like the Marfan and Ehler-Danlos syndromes or congenital bicuspid aortic valve. Younger patients may develop aortic aneurysms of the thoracoabdominal aorta after an aortic dissection. It can also be caused by blunt injury.
Atherosclerosis is the principal cause of descending aortic aneurysms, while aneurysms of the aortic arch may be due to dissection, atherosclerosis or inflammation.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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