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Plain film shows a pre-vesical stone on the left.
13 minutes after infusion of contrast medium there is contrast of the right pyelon and in the bladder, but yet no contrast of the left pyelon. There is also contrast outlining the left kidney, whereas it has already cleared from the right (delayed nephrogram).
Two hours after infusion you can appreciate a distension of the left ureter and a hydronephrosis of the left pyelon.