A history of Anuria suggests Acute Renal failure. Ultrasonography is the ideal imaging tool in Renal failure because of its non dependence on Renal function. As it allows visualization of : Pelvicalyceal system ofAssessment of Renal Size o Structural anomalies and calculi . Note - In this question DTPA scan has not been provided as an option. So, the best answer is USG.
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