Figure 2a. (a) CO2-enhanced abdominal aortogram (left anterior oblique projection) demonstrates right renal artery stenosis (straight arrow). Overlying bowel gas (curved arrow) deteriorates the CO2-enhanced image. (b) Selective gadolinium-enhanced right renal artery angiogram (left anterior oblique projection) obtained with 6 mL of full-strength gadodiamide clearly defines the right renal artery stenosis (arrow). (c) Gadolinium-enhanced angiogram (left anterior oblique projection) obtained after injection of 6 mL of gadodiamide through a vascular sheath (curved arrow) in the abdominal aorta demonstrates a widely patent right main renal artery (straight arrow) after balloon angioplasty and stent placement. POST = postangioplasty.