Comparison of T2-weighted imaging, diffusion-weighted imaging and contrast-enhanced T1-weighted MR imaging for evaluating perianal fistulas

Clin Imaging. 2017 Jul-Aug:44:16-21. doi: 10.1016/j.clinimag.2017.03.019. Epub 2017 Mar 31.

Abstract

Purpose: To compare the lesion conspicuity and diagnostic performance of three imaging data sets (T2WI, combined T2WI and DWI [combined DWI], contrast-enhanced (CE)-T1WI) in assessing perianal fistulas.

Methods: Two radiologists with 7 and 15years of experience assessed 28 fistulas from 24 patients in each image set.

Results: The lesion conspicuity was improved for only one reader after reading the combined DWI (P=0.0039) and CE-T1WI (P=0.0215). The accuracy was stationary for fistula type (reader 1, all 93%; reader 2, all 89%) or for direction of internal opening (96% for all sets; 92% for CE-T1WI).

Conclusion: Although combined DWI and CE-T1WI might improve fistula conspicuity, they showed comparable diagnostic performance to T2WI.

Keywords: Diffusion; Fistula; Fistula-in ano; Gadolinium; Magnetic resonance imaging.

Publication types

  • Comparative Study
  • Evaluation Study

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Anal Canal*
  • Contrast Media
  • Diffusion Magnetic Resonance Imaging / methods
  • Female
  • Fistula / diagnostic imaging
  • Fistula / pathology*
  • Humans
  • Magnetic Resonance Imaging / methods*
  • Male
  • Middle Aged
  • Rectal Fistula / diagnostic imaging
  • Rectal Fistula / pathology*
  • Young Adult

Substances

  • Contrast Media