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Fig. 6C. —53-year-old woman with one episode of crampy lower abdominal pain and gross hematuria 1 month earlier. Sonogram (not shown) at another institution revealed hydronephrosis but no definite stone. Patient is now asymptomatic but with persistent microhematuria. Curved planar reformation of right kidney and ureter from enhanced CT shows moderate hydroureteronephrosis resulting from obstructing calculus (arrow) in distal ureter. Delay in contrast excretion from right kidney is evident. In this patient, CT urography provided efficient complete examination of obstructed right urinary tract, obviating serial follow-up images over ensuing hours, which would have been necessary with conventional excretory urography.