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Canadian Journal of Gastroenterology
Volume 26, Issue 8, Pages 515-520
Original Article

Evaluation of Endoscopist and Pathologist Factors Affecting the Incidence of Microscopic Colitis

Christopher N Andrews,1 Paul L Beck,1 Lynn Wilsack,1 Stefan J Urbanski,2 and Martin Storr1,3

1Department of Medicine, Division of Gastroenterology, University of Calgary, Calgary, Alberta, Canada
2Department of Pathology, University of Calgary, Calgary, Alberta, Canada
3Ludwig Maximilian University, Munich, Germany

Received 27 October 2011; Accepted 14 December 2011

Copyright © 2012 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


BACKGROUND: Microscopic colitis (MC) is an umbrella term for collagenous colitis (CC) and lymphocytic colitis (LC). The incidence of these diseases is increasing for unclear reasons.

OBJECTIVE: To identify factors that may impact diagnosis rates of MC in a North American population.

METHODS: Population-based pathology and endoscopy databases were searched to identify all cases of MC and the number of lower endoscopy (LE) procedures performed over a five-year period (January 2004 to December 2008) in a catchment area of 1.2 million people. Endoscopist characteristics were compared with diagnostic rates.

RESULTS: MC incidence increased from 1.68 per 10,000 in 2004, to 2.68 per 10,000 in 2008, with an average annual increase of 12% per year (95% CI 7% to 16%; P<0.0001). The incidence rate of LC increased but the rate of CC remained stable over the study period. Approximately one-half of the cases were probable and one-half were definite based on pathologists’ reports – a proportion that remained stable over time. The number of LEs per population increased by 4.6% annually over the study period (95% CI 2.8% to 6.4%; P<0.0001), and biopsy rates in LE for MC indications (eg, unexplained diarrhea, altered bowel habits) increased over time (3.4% annual increase [95% CI 1.8% to 6.0%]; P<0.001). Endoscopists with an academic practice, gastroenterologists and those with lower annual endoscopy volumes were more likely to make a diagnosis of MC.

CONCLUSION: The incidence of MC is rising due to increased diagnosis of LC, while CC incidence remains stable. Patients with MC symptoms have stable endoscopy rates but are being biopsied more often. Physician training, practice type and endoscopy volume impact the diagnostic rates of MC.