fig1

Figure 1. E. Stanley Crawford classification of thoracoabdominal aortic aneurysm repair by extent of involvement. Extent I repairs involve most or all of the descending thoracic aorta and the upper abdominal aorta. Extent II repairs involve the same segments as extent I repairs but also extend into the infrarenal abdominal aorta. Extent III repairs involve a combination of the distal half, or less, of the descending thoracic aorta (beginning below the sixth rib) and varying portions of the abdominal aorta. Extent IV repairs involve the abdominal aorta below the diaphragm. Image created by Scott A. Weldon, MA, CMI, FAMI and printed with permission from Baylor College of Medicine.