Urolithiasis

, Volume 41, Issue 1, pp 43–46

Evaluation of acute renal colic: a comparison of non-contrast CT versus 3-T non-contrast HASTE MR urography

  • M. J. Semins
  • Z. Feng
  • B. Trock
  • M. Bohlman
  • W. Hosek
  • B. R. Matlaga
Original Paper

DOI: 10.1007/s00240-012-0525-8

Cite this article as:
Semins, M.J., Feng, Z., Trock, B. et al. Urolithiasis (2013) 41: 43. doi:10.1007/s00240-012-0525-8

Abstract

With the introduction of a 3-T scanner, magnetic resonance urography (MRU) may be an alternative imaging modality for evaluation of acute renal colic. We performed a prospective study to compare the performance of computed tomography (CT) with half-Fourier single shot turbo spin-echo (HASTE) MRU in the evaluation of patients with suspected renal colic. Patients presenting to the emergency department with acute renal colic were eligible for inclusion. Following a standard CT stone evaluation, patients underwent a non-contrast HASTE MRU study with a 3-T scanner. The presence of perinephric fluid, hydronephrosis, ureteral obstruction, and calculus was assessed. A total of 22 patients completed the study. Twenty (91 %) were diagnosed with an upper tract stone by radiographic findings. MRU detected a discrete stone in 50 % of the patients with stones detected by CT. Perinephric fluid was noted in 12 MRUs, compared to 7 CTs. Using CT as the reference standard, the combination of stone or perinephric fluid and ureteral dilation gave MRU a sensitivity of 84 %, specificity of 100 %, and accuracy of 86 % (95 % CI 0.72–1.0). HASTE MRU with a 3-T MR scanner can reliably detect the presence of upper urinary tract obstruction. Although CT imaging remains the superior modality with which to detect calculi, MRU detects a greater number of secondary signs of upper tract obstruction. For situations in which the use of ionizing radiation is undesirable, MRU is a reasonable imaging alternative.

Keywords

CTMRINephrolithiasisRadiation

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • M. J. Semins
    • 2
  • Z. Feng
    • 1
  • B. Trock
    • 1
  • M. Bohlman
    • 1
  • W. Hosek
    • 1
  • B. R. Matlaga
    • 1
  1. 1.Departments of Urology and Emergency MedicineJames Buchanan Brady Urological Institute, The Johns Hopkins University School of MedicineBaltimoreUSA
  2. 2.University of Pittsburgh Medical CenterMercy HospitalPittsburghUSA