A Rare Case of Post-renal Obstruction Causing AKI

A 61-year-old man with no significant past medical history presented to the hospital with bilateral flank pain and 20 lbs weight loss in the previous few months. Computed tomography (CT) showed bilateral ureteral obstruction in the mid-ureter with thickening of tissue around the great vessels. There were no stones. These findings are consistent with retroperitoneal fibrosis. Retrograde ureterogram showed 4 cm ...