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Microscopic colitis — Clinical Guidelines

Overview

Microscopic colitis is a chronic inflammatory condition of the colon characterized by chronic watery diarrhea, often with normal endoscopic findings. It includes subtypes like lymphocytic colitis and collagenous colitis 2.

Diagnosis

Histological Examination: Essential for accurate diagnosis, requiring biopsies from multiple colonic segments 2.

Endoscopic Findings: Often non-specific; diagnosis relies heavily on histological criteria 2.

Observer Variability: Significant inter- and intra-observer variability in histologic diagnosis; consensus among pathologists is crucial 6.

Biopsy Sampling: Variability in strategies for biopsy sampling and staining techniques among pathologists 4.

Management

First-Line Treatment: Budesonide is recommended for inducing remission in most patients 2.

Adjunctive Treatments: Alternatives to budesonide are suggested but not specified in detail 2.

Drug-Induced Cases: Consider discontinuation or alternative medications if colitis is suspected to be drug-induced (e.g., proton pump inhibitors like lansoprazole, potassium-competitive acid blockers like vonoprazan) 1 3.

Special Populations

Elderly: Increased incidence noted in older adults (ages ≥60 years) 3.

Comorbidities: No specific management adjustments mentioned for comorbidities; general management principles apply 2.

Key Recommendations

Histological Confirmation: Essential for diagnosing microscopic colitis due to non-specific endoscopic findings (Evidence: Strong 2).

Budesonide for Remission: Use budesonide as the first-line treatment for inducing remission (Evidence: Strong 2).

Consider Drug-Induced Causes: Evaluate and consider discontinuing or switching medications suspected to cause microscopic colitis, such as lansoprazole and vonoprazan (Evidence: Moderate 1 3).

Standardize Diagnostic Practices: Pathologists and clinicians should reach consensus on biopsy sampling and diagnostic criteria to improve diagnostic consistency (Evidence: Expert opinion 4).

References

1 Nakanishi K, Uwai Y, Nabekura T. Vonoprazan-associated Microscopic Colitis and Continued Use After Onset: A Study Using a Japanese Pharmacovigilance Database. In vivo (Athens, Greece) 2025. link 2 Silva BCD, Azevedo MFC, Mello MK, Macedo MRF, Caetano JS, Moraes ACDS et al.. DIAGNOSIS AND TREATMENT OF MICROSCOPIC COLITIS: POSITION PAPER ON BEHALF OF THE BRAZILIAN FEDERATION OF GASTROENTEROLOGY. Arquivos de gastroenterologia 2024. link 3 Yamashiro K, Jouta M, Hosomi K, Yokoyama S, Ozaki Y, Hirata A et al.. Adverse event profiles of microscopic colitis in the Japanese Adverse Drug Event Report (JADER) database. Scientific reports 2022. link 4 Goudkade D, Fiehn AK, Landolfi S, Villanacci V, Munck LK, Engel PJH. An investigation of European pathologists' approach to diagnose microscopic colitis. Annals of diagnostic pathology 2020. link 5 Andrews CN, Beck PL, Wilsack L, Urbanski SJ, Storr M. Evaluation of endoscopist and pathologist factors affecting the incidence of microscopic colitis. Canadian journal of gastroenterology = Journal canadien de gastroenterologie 2012. link 6 Limsui D, Pardi DS, Smyrk TC, Abraham SC, Lewis JT, Sanderson SO et al.. Observer variability in the histologic diagnosis of microscopic colitis. Inflammatory bowel diseases 2009. link 7 Trolli P. Microscopic colitis. Gastroenterology nursing : the official journal of the Society of Gastroenterology Nurses and Associates 1999. link

Microscopic colitis