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Diffusion-weighted MRI: role in detecting abdominopelvic internal fistulas and sinus tracts

Christine Schmid-Tannwald1, Garima Agrawal, Farid Dahi

  • 1The University of Chicago, Department of Radiology, Chicago, Illinois 60637, USA. christine.schmid-tannwald@med.uni-muenchen.de

Journal of Magnetic Resonance Imaging : JMRI
|September 29, 2011
PubMed
Abstract

Insights

Diffusion-weighted MR imaging (DW-MRI) significantly improves the detection of internal fistulas and sinus tracts when added to T2-weighted (T2w) images. This technique is a valuable tool, particularly for patients with kidney issues.

Area of Science:

  • Radiology
  • Medical Imaging
  • Gastroenterology

Background:

  • Internal fistulas (IFs) and sinus tracts (STs) are complex anatomical abnormalities.
  • Accurate diagnosis of IFs and STs is crucial for effective patient management.
  • Conventional MRI sequences may have limitations in visualizing these structures.

Purpose of the Study:

  • To evaluate the added diagnostic value of diffusion-weighted MR imaging (DW-MRI) to T2-weighted (T2w) imaging for detecting IFs and STs.
  • To compare the diagnostic performance of T2w imaging alone versus combined sequences.

Main Methods:

  • A retrospective analysis of 14 patients with 25 IFs and STs.
  • Two independent observers reviewed T2w images, T2w+DW-MRI, and T2w+contrast-enhanced T1-weighted (CE T1w) images.
  • Detection rates and confidence scores were compared across different imaging combinations.

Main Results:

  • Detection rates for IFs and STs significantly improved when DW-MRI or CE T1w images were combined with T2w images (P ≤ 0.01).
  • T2w+DW-MRI and T2w+CE T1w achieved similar detection rates (76% and 96%, respectively).
  • Confidence scores were higher with T2w+CE T1w compared to T2w+DW-MRI.

Conclusions:

  • DW-MRI provides incremental value to T2w imaging for diagnosing IFs and STs.
  • DW-MRI serves as a beneficial adjunct, especially in patients with renal failure where contrast agents may be contraindicated.
  • Combined imaging sequences enhance diagnostic accuracy for IFs and STs.

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