THORACOABDOMINAL AORTIC ANEURYSM EXTENTS.

In 1986, Crawford described the first TAAA (thoracoabdominal aortic aneurysm ) classification scheme based on the anatomic extent of the aneurysm (click the picture to enlarge)

Aneurysm classification
  • Type I involves most of the descending thoracic aorta from the origin of the left subclavian to the suprarenal abdominal aorta.
  • Type II is the most extensive, extending from the subclavian to the aortoiliac bifurcation.
  • Type III involves the distal thoracic aorta to the aortoiliac bifurcation. 
  • Type IV TAAAs are limited to the abdominal aorta below the diaphragm. 
  • Type V, which extends from the distal thoracic aorta including the celiac and superior mesenteric origins but not the renal arteries (Safi’s group.)

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