When is combined radiography and ultrasonography indicated for the evaluation of nephrolithiasis?

Updated: Sep 16, 2021
  • Author: Chirag N Dave, MD; Chief Editor: Bradley Fields Schwartz, DO, FACS  more...
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Sometimes, a KUB abdominal flat plate radiograph is used in addition to ultrasonography to help identify and monitor suspected stones, especially if renal dilation is detected. As with the KUB radiograph alone, any density detected along the expected course of the ureter is not guaranteed to be an actual stone within the collecting system.

The combination of renal ultrasonography with KUB radiography has been proposed as a reasonable initial evaluation protocol when a CT scan cannot be performed or is unavailable. When combined with KUB radiography, ultrasonography can quickly and inexpensively provide substantial information about the urinary tract without the risk of contrast nephrotoxicity or hypersensitivity. IVP is rarely used in most clinicial settings but is an option for patients for whom additional information is required for a diagnosis or for whom the etiology of the pain remains unclear.

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