fig4

Figure 4. Classification of thoracoabdominal aortic aneurysms. Extent I: distal to the left subclavian artery to above the renal arteries. Extent II: distal to the left subclavian artery to below the renal arteries; this is the most extensive type of aneurysm and the extent with the greatest risk of paraplegia as a complication of repair. Extent III: from below the sixth intercostal space to below the renal arteries. Extent IV: from below the twelfth intercostal space to the iliac bifurcation (total abdominal aortic aneurysm). Extent V: below the sixth intercostal space to just above the renal arteries. From Safi et al.^[36] (with permission).