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A 23-year-old man with urinary obstruction. (A) Axial and (B) coronal CT images of the abdomen obtained after intravenous contrast administration showing mild hydronephrosis (arrowhead) on the left, with a discrete delay in the concentration of intravenous contrast by the left kidney caused by a soft-tissue density mass (lymphoma) involving the middle third of the left ureter (arrow).
