When is a noncontrast CT scan of the kidneys, ureters, and bladder (KUB) or a CT urogram indicated in the evaluation of acute pyelonephritis (kidney infection)?

Updated: Jul 01, 2021
  • Author: Tibor Fulop, MD, PhD, FACP, FASN; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Answer

If findings are suggestive of nephrolithiasis complicating the presentation, a noncontrast CT scan of the kidneys, ureters, and bladder (KUB) or a CT urogram should be obtained to exclude the possibility of obstruction or hydronephrosis. [16] CT has 97% accuracy in identifying kidney stones. (See the images below.)

Nonobstructing distal left ureteral calculus 2 X 1 Nonobstructing distal left ureteral calculus 2 X 1 X 2 cm.
Bilateral hydronephrosis. Bilateral hydronephrosis.

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