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Fig. 4B —58-year-old man with acute onset of severe excruciating back and abdominal pain due to type II aortic dissection. Contrast-enhanced MR angiograms show type II dissection with extension of dissection flap (arrow, A) downward below origin of superior mesenteric artery (SMA) and occlusion of right renal artery (not shown). There is an occlusion of ileocolic artery (arrowhead, B).