Definitions for aortic aneurysm, thoracic
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U.S. National Library of Medicine
Aortic Aneurysm, Thoracic
An abnormal balloon- or sac-like dilatation in the wall of the THORACIC AORTA. This proximal descending portion of aorta gives rise to the visceral and the parietal branches above the aortic hiatus at the diaphragm.
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