Anesthesiology and Intensive Care

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