Aortic Aneurysm, Thoracic

**Definition:** 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.

**Tree numbers:** - C14.907.055.239.125 - C14.907.109.139.125

**Synonyms:** - Aneurysm, Thoracic Aorta - Thoracic Aortic Aneurysm - Aneurysm, Thoracic Aortic - Thoracic Aorta Aneurysm