Microscopic colitis in Northern Ireland: an updated clinicopathological audit and assessment of compliance with

Michelle Moore1, Helen G Coleman2, Patrick B Allen3

  • 1Department of Cellular Pathology, Royal Victoria Hospital, Belfast Health and Social Care Trust, Belfast, UK.

Abstract

Insights

Microscopic colitis incidence in Northern Ireland increased significantly from 2017-2020, driven by improved diagnostic methods. Coeliac serology testing compliance also rose, though continued awareness is needed.

Area of Science:

  • Gastroenterology
  • Epidemiology
  • Pathology

Background:

  • Microscopic colitis, encompassing collagenous colitis and lymphocytic colitis, presents diagnostic challenges.
  • Previous studies established baseline epidemiology in Northern Ireland.
  • Updated data is crucial for understanding current trends and guideline adherence.

Purpose of the Study:

  • To provide updated incidence data for microscopic colitis in Northern Ireland (2017-2020).
  • To analyze changes in diagnostic methods and clinicopathological associations.
  • To compare findings with 2020 European guidelines.

Main Methods:

  • Case identification through the Belfast Health and Social Care Trust pathology laboratory system.
  • Collating demographic and clinical data from electronic healthcare records.
  • Analysis of new diagnoses of collagenous colitis and lymphocytic colitis.

Main Results:

  • 217 new diagnoses (41% collagenous colitis, 59% lymphocytic colitis) from 2017-2020.
  • Incidence increased to 11.5 per 100,000 adults in 2019, a 71.6% rise from 2008-2016.
  • Increased diagnosis via separate right/left colon sampling (85% vs. 30%) and improved coeliac serology testing (89% vs. 75%).

Conclusions:

  • Improved endoscopic sampling and pathology coding practices have increased microscopic colitis detection.
  • Enhanced clinicopathological communication contributes to higher reported incidence.
  • While coeliac serology testing has improved, sustained clinical vigilance is necessary for all microscopic colitis patients.

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