What is the role of CT scanning in the workup of hydronephrosis and hydroureter?

Updated: Dec 16, 2020
  • Author: Dennis G Lusaya, MD; Chief Editor: Bradley Fields Schwartz, DO, FACS  more...
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Indications for CT scanning include the following:

  • Ultrasonography results are equivocal
  • The kidneys cannot be well visualized
  • The cause of the obstruction cannot be identified

The combination of a plain film of the abdomen (including tomographic cuts to detect radiopaque calculi), ultrasonography, and, if necessary, CT scanning is adequate for diagnostic purposes in over 90% of cases. [14] It should be noted, however, that the false-positive rate for ultrasonography may be as high as 25% if only minimal criteria (any visualization of the collecting systems) are used to diagnose obstruction.

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