Limitations of Noncontrast CT for Measuring Ureteral Stones
- 1 December 2003
- journal article
- research article
- Published by Mary Ann Liebert Inc in Journal of Endourology
- Vol. 17 (10), 851-854
- https://doi.org/10.1089/089277903772036127
Abstract
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. 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. The NCCT overestimated stone size by approximately 30% to 50% compared with KUB. 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.Keywords
This publication has 12 references indexed in Scilit:
- A Comparison Of Unenhanced Helical Computerized Tomography Findings And Renal Obstruction Determined By Furosemide 99mTechnetium Mercaptoacetyltriglycine Diuretic Scintirenography For Patients With Acute Renal ColicJournal of Urology, 2002
- COMPARISON OF HELICAL COMPUTERIZED TOMOGRAPHY AND PLAIN RADIOGRAPHY FOR ESTIMATING URINARY STONE SIZEJournal of Urology, 2002
- Relationship of Spontaneous Passage of Ureteral Calculi to Stone Size and Location as Revealed by Unenhanced Helical CTAmerican Journal of Roentgenology, 2002
- Unenhanced helical CT of ureteral stones: a replacement for excretory urography in planning treatment.American Journal of Roentgenology, 1998
- THE VALUE OF UNENHANCED HELICAL COMPUTERIZED TOMOGRAPHY IN THE MANAGEMENT OF ACUTE FLANK PAINJournal of Urology, 1998
- URETERAL STONES CLINICAL GUIDELINES PANEL SUMMARY REPORT ON THE MANAGEMENT OF URETERAL CALCULIJournal of Urology, 1997
- Ureteral calculi in patients with flank pain: correlation of plain radiography with unenhanced helical CT.Radiology, 1997
- Diagnosis of acute flank pain: value of unenhanced helical CT.American Journal of Roentgenology, 1996
- Comparison of Radiological Measurement and Actual Size of Ureteral CalculiScandinavian Journal of Urology and Nephrology, 1978
- Relation of spontaneous passage of ureteral calculi to sizeUrology, 1977