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Fig. 7B. —82-year-old man with thoracic aortic aneurysm type B and thoracoabdominal aortic dissection extending from just distal to left subclavian artery to proximal right common iliac artery. Patient was first diagnosed with aortic dissection 12 years ago. For more than 10 years, symmetric perfusion of kidneys was seen, until recently when CT showed hypoperfusion of right kidney. CT scan obtained 1 year after A shows decrease in attenuation of contrast-enhanced blood in false lumen (arrow) when compared with true lumen. Enhancement of right kidney is markedly diminished, which is compatible with progressive hypoperfusion.