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Fig. 2B —31-year-old man with unilateral renal artery stenosis (RAS) in right main renal artery. Intraarterial digital subtraction angiography shows total occlusion in right main renal artery (arrow) with extensive collateral formation including periureteric collaterals. Note early opacification of upper polar region in right kidney, which is supplied by intact segmental artery and accessory renal artery.