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Thoracoabdominal aortic aneurysms 

Thoracoabdominal aortic aneurysms
Chapter:
Thoracoabdominal aortic aneurysms
Author(s):

Roberto Chiesa

, Efrem Civilini

, Germano Melissano

, Luca Bertoglio

, and Enrico Rinaldi

DOI:
10.1093/med/9780199658220.003.0062
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date: 18 October 2019

A thoracoabdominal aortic aneurysm (TAAA) is defined by dilatation of the aorta’s diameter at the diaphragmatic hiatus that is at least 50% greater than normal, with varying degrees of thoracic and abdominal extension. As aortic diameter varies from the most proximal to the most distal section, the aortic diameter should be assessed relative to nearby healthy sections of aortic tissue whilst accounting for the effects of age, sex, and body size. TAAAs should be interpreted according to pathology, the two most common being medial degeneration and aortic dissection. TAAA repairs are classified according to the extent of aortic involvement. The Crawford classification facilitates risk stratification, helps surgeons plan the surgical approach, selects protective adjuncts, and facilitates standardized reporting of results. Aneurysms caused by aortic dissection can be further classified in terms of the extent of aortic involvement, chronicity, and type of aortic wall disruption.

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