Diseases Thoracic aortic aneurysm: Overview, Causes by January 21, 2011January 21, 2011 Definition A thoracic aortic aneurysm is a widening (bulging) of part of the wall of the aorta, the body’s largest artery. Overview, Causes, & Risk Factors Thoracic aneurysms most often occur… 0 FacebookTwitterGoogle +Pinterest