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Pseudomembranous collagenous colitis.

Shan Yuan1, Victoria Reyes, Mary P Bronner

  • 1Department of Pathology (S.Y., M.P.B.), University of Washington, Seattle, Washington, USA.

The American Journal of Surgical Pathology
|September 26, 2003
PubMed
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Pseudomembranous collagenous colitis, a new variant of collagenous colitis, presents with pseudomembranes. This finding suggests a broader spectrum for collagenous colitis, potentially involving toxin or ischemia in its development.

Area of Science:

  • Gastroenterology
  • Colorectal Pathology

Background:

  • Collagenous colitis is characterized by a thickened subepithelial collagen layer.
  • Acute inflammatory changes, such as pseudomembranes, are not well-established features of collagenous colitis.

Purpose of the Study:

  • To describe the clinical and histologic features of pseudomembranous collagenous colitis.
  • To determine if pseudomembranes are a distinct entity or part of the collagenous colitis spectrum.

Main Methods:

  • Retrospective case series of 10 patients with pseudomembranous collagenous colitis.
  • Histologic examination of colonic biopsies.
  • Clinical data review, including infectious workup for Clostridium difficile.

Main Results:

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  • Ten patients presented with pseudomembranous collagenous colitis.
  • Clostridium difficile infection was identified in only one patient.
  • The remaining nine patients had no other identifiable cause for pseudomembranes.

    • Conclusions:

    • Pseudomembranes can be a feature within the spectrum of collagenous colitis.
    • Evaluation for collagenous colitis is important in cases of pseudomembranous colitis.
    • Infectious or ischemic causes should be excluded in patients with pseudomembranes.