Renal tubular ectasia
History of a single episode of urolithiasis. Currently asymptomatic. Evaluation per request of urology.
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There are not calcifications in either kidney... and a recent (within a month) CT of the abdomen and pelvis did not show any renal stones.
On the IVP, there is exaggerated "strandy" enhancement of the medullary pyramids with a "paintbrush" appearance. No filling defect in either kidney.