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Normal ureter size on unenhanced helical CT.

Natalie Zelenko1, Deidre Coll, Arthur T Rosenfeld

  • 1Weill Medical College of Cornell University, 420 E 70th St., New York, NY 10021, USA. nam2001@med.cornel.edu

AJR. American Journal of Roentgenology
|March 25, 2004
PubMed
Summary

Unenhanced helical CT is key for diagnosing ureteral stones. A ureter diameter of 3 mm or less on CT scans indicates normal, non-obstructed ureters.

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Area of Science:

  • Radiology
  • Urology
  • Medical Imaging

Background:

  • Unenhanced helical CT is the primary imaging modality for acute flank pain and suspected ureterolithiasis.
  • Secondary signs of obstruction, like ureteral dilatation, are crucial diagnostic indicators on CT scans.

Purpose of the Study:

  • To define ureteral dilatation on unenhanced helical CT.
  • To establish the normal range of ureter size using unenhanced helical CT.

Main Methods:

  • Retrospective review of unenhanced helical CT scans from 212 patients with acute ureterolithiasis.
  • Measurement of ureteral diameter on both asymptomatic and obstructed sides.
  • Determination of mean ureteral diameter below the ureteropelvic junction.

Main Results:

  • The mean ureteral diameter on the asymptomatic side was 1.8 mm (SD 0.9 mm).
  • The mean ureteral diameter on the obstructed side was 7 mm (SD 3.2 mm).
  • 96% of asymptomatic ureters measured 3 mm or smaller in diameter.

Conclusions:

  • A ureteral diameter of 3 mm should be considered the upper limit of normal for non-obstructed ureters on unenhanced helical CT.
  • This finding aids in differentiating obstruction from normal ureteral size in patients with suspected ureterolithiasis.

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