Limitations of noncontrast CT for measuring ureteral stones.
OBJECTIVE
Patients with renal colic are frequently evaluated in the emergency room with a helical noncontrast CT scan (NCCT) as the primary imaging modality. Treatment decisions are often based on the size of the ureteral stone(s). We wished to assess the accuracy of NCCT in estimating ureteral stone size compared with plain abdominal (KUB) films.


METHODS
Forty-eight patients were identified who had ureteral stones seen on NCCT and KUB films performed on the same day. The number of consecutive images on which a ureteral stone was visible on NCCT was multiplied by the reconstruction interval of 5 mm to create a size estimate, which was compared with the measurements of the same stone seen on the KUB film.


RESULTS
The NCCT overestimated stone size by approximately 30% to 50% compared with KUB.


CONCLUSIONS
Counting the number of consecutive NCCT images depicting a ureteral stone is not an accurate method of stone measurement when a reconstruction interval of 5 mm is used. Urologists should consider stone measurement techniques carefully and understand the limitations of imaging studies when evaluating patients with symptomatic ureteral stones.
Van Appledorn
Scott
S
Department of Urology, University of Miami School of Medicine, Miami, FL 33136, USA.
Ball
Adam J
AJ
Patel
Vipul R
VR
Kim
Sandy
S
Leveillee
Raymond J
RJ
D000704:Analysis of Variance; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D011336:Probability; D011860:Radiography, Abdominal / Q000379:methods*; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014514:Ureteral Calculi / Q000000981:diagnostic imaging* / Q000503:physiopathology