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Figure 3a.   Abdominal aortic coarctation. Dynamic subtraction MR angiograms from four of five phases acquired show vascular enhancement by tracking a 0.04-mmol/kg bolus of gadopentetate dimeglumine. In the arterial phase (a), abdominal aortic coarctation (arrow) and the renal arteries are well visualized with minimal venous enhancement. The portal veins (arrowheads in b), hepatic veins (arrows in c), and inferior vena cava (arrowheads in d) are demonstrated in the different phases.