Related Experiment Video

Updated: Jul 27, 2025

Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse
07:41

Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse

Published on: April 17, 2019

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Precise and comprehensive evaluation of perianal fistulas, classification and related complications using magnetic

Wei-Wei Zhao1, Jing Yu2, Jun Shu2

  • 1Department of Radiology, Xi'an Hospital of Traditional Chinese Medicine Xi'an, Shaanxi, China.

American Journal of Translational Research
|June 12, 2023
PubMed
Abstract

Insights

Magnetic resonance imaging (MRI) comprehensively evaluates perianal fistulas and their complications. This study demonstrates MRI

Area of Science:

  • Radiology
  • Gastroenterology
  • Surgical Anatomy

Background:

  • Perianal fistulas are complex conditions requiring accurate imaging for effective management.
  • Magnetic resonance imaging (MRI) is a key modality for visualizing anorectal anatomy and pathology.

Purpose of the Study:

  • To assess the utility of preoperative perianal MRI in comprehensively evaluating perianal fistulas and associated complications.
  • To classify fistulas using established grading systems and identify anatomical details relevant to surgical planning.

Main Methods:

  • 115 patients with perianal fistulas underwent preoperative MRI.
  • Fistulas, openings, tracts, and complications were evaluated and classified using Park's, Standard Practice Task Force, and St. James's grading systems.
  • Internal opening position and involvement of adjacent structures like the levator ani muscle were assessed.

Main Results:

  • 169 primary fistulas and 198 internal openings were identified in 115 patients.
  • Fistulas were classified by Park's (intersphincteric, trans-sphincteric, etc.) and St. James's grade.
  • Complex features included secondary tracts (20%), abscesses (52.2%), levator ani muscle involvement (10.4%), and soft tissue edema (20.9%).

Conclusions:

  • Preoperative perianal MRI is a valuable tool for detailed assessment of perianal fistulas.
  • MRI enables precise classification and identification of complications, aiding surgical decision-making.
  • The comprehensive evaluation provided by MRI improves understanding of fistula complexity and extent.
Keywords:
Perianal fistulaclassificationcomplicationsmagnetic resonance imaging

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