Revision 2 for 'CT KUB'

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CT KUB

Computed tomograpy Kidneys, Ureters, Bladder (CT KUB) is a quick non-invasive technique for diagnosis of urolithiasis.

Advantages 

  • identification of calcified renal tract calculi size and position

    • stone composition assessment with dual energy CT

  • assessment of the sequelae of calculi

  • assessement of other causes of flank pain if negative for calculus disease

Disadvantages 

  • exposure to ionizing radiation

Technique

Procedure 

Actual procedure will vary depending on institutional protocol/guidelines but below is a typical description:

  1. Non contrast CT scanning is ideally performed on a multi-detector computed tomography (MDCT) scanner.
  2. Supine or prone patient positioning
    • prone has the advantage of assessing stones near the VUJ which may have just passed
    • some institutions may perform a limited pelvic scan in prone if the supine scan shows a calculus near the VUJ
  3. Data interpretation with the use of axial, sagittal and coronal reformatted images for proper evaluation.

Findings

  • identification of calcified renal tract calculi size and position

    • stone composition assessment with dual energy CT

  • assessment of the sequelae of calculi

    • obstruction

    • infection

  • assessment of other causes of flank pain if negative for calculus disease

  • presence of further calculi at risk of obstructing

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