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Fig. 7. —34-year-old man with solitary right kidney and obstruction of ureteropelvic junction. Double-dose gadopentetate dimeglumine (0.2 mmol/kg of body weight) MR angiogram obtained after low-dose MR urogram (not shown) shows relationship between renal artery and collecting system. Note vessel (arrow) crossing ureteropelvic junction and double renal artery supplies.