What is the role of KUB radiography in the diagnosis of nephrolithiasis?

Updated: Jun 21, 2018
  • Author: Chirag N Dave, MD; Chief Editor: Bradley Fields Schwartz, DO, FACS  more...
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Answer

The KUB radiograph is also quite accurate for helping determine the exact size and shape of a visible radiopaque stone and sometimes is more accurate than CT in this regard. Note that most stones will appear larger on KUB radiograph than on CT, with CT-based measurement of maximum stone dimension approximately 12% smaller than a corresponding KUB-based measurement. [24]

Many calcifications observed on the KUB radiograph are phleboliths, vascular calcifications, calcified lymph nodes, appendicoliths, granulomas, various calcified masses, or even bowel contents. All can be confused with urinary tract calculi.

The insoluble radiopaque carrier for osmotically controlled-release oral system (OROS) pharmaceuticals can sometimes be mistaken for urinary calculi on KUB radiographs.


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