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Radiological history of an infant with severe hydronephrosis secondary to UPJ obstruction and biphasic diuretic curve. (A) Ultrasound confirming SFU grade 4 hydronephrosis at 2 months of age. (B) Diuretic renogram showing symmetrical uptake with biphasic washout curve. (C) Ultrasound at 12 months of age showing slightly improving but still SFU grade 4 hydronephrosis. (D) Improved washout curve on diuretic renogram, but still with delayed emptying.
