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Fig. 3B .—Mesenteric ischemia in 26-year-old woman.

A and B, Gadolinium-enhanced breath-hold MR angiograms show segmental occlusion of superior mesenteric artery (large arrow, A). Distal part of the superior mesenteric artery (small arrow, A) is revascularized by arc of Riolan (arrowheads, A and B).