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![Management of chronic type B aortic dissection](https://image.oaes.cc/5ba79807-a190-4563-87b5-ae183e7ee0cc/5135.fig.4.jpg)
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).