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Fig. 7B. —57-year-old woman after undergoing renal transplantation and placement of femorofemoral bypass graft from right to left due to left common external iliac occlusion. Vistaflex stent (Angiodynamics) is in right common iliac artery. Four oblique coronal multiplanar reformatted images (left) obtained through common iliac artery and Vistaflex stent show there is minimal artifact due to stent (grade 2 lumen visibility). Significant stenosis distal to stent, which was treated with percutaneous transluminal angoplasty, is also visible. Magnified CO₂ angiogram (right) shows similar findings; however, because of poor contrast resolution of CO₂, diagnosis is less evident.