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Figure 1. Classification of thoracoabdominal aortic aneurysm (TAAA) extent based on Crawford. In Extent I the repair comprises most
of the descending thoracic and upper abdominal aorta; Extent II involves most of the descending thoracic aorta and most or all of the
abdominal aorta; Extent III involves the distal descending thoracic aorta and varying segments of abdominal aorta; and Extent IV
involves most or all of the abdominal aorta including the segment from which the visceral vessels arise. (Reproduced by permission of
Mayo Foundation for Medical Education and Research. All rights reserved).

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Figure 2. Illustration representing the multibranched stent-graft system presented by Chuter et al. in 2001 (A) , and the evolution of
the manufactured devices (B and C) until the currently standardized off-the-shelf endograft (D). (Reproduced by permissionof Mayo
Foundation for Medical Education and Research. All rights reserved).