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Katz et al. Vessel Plus 2023;7:1 https://dx.doi.org/10.20517/2574-1209.2022.52 Page 3 of 16

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.

Figure 2. Preoperative considerations by organ system for assessment and diagnostic evaluation before TAAA or DTA repair. CT:
Computed tomography; DTA: descending thoracic aneurysm; NOAC: non-vitamin K oral anticoagulant (dabigatran, rivaroxaban,
[1]
apixaban, edoxaban); TAAA: thoracoabdominal aortic aneurysm. *As appropriate. Reprinted from the ref. , with permission from
Elsevier.
requested when indicated, and preoperative imaging should be obtained in selected patients as a baseline
reference.