Collagenous colitis: a distinctive and potentially reversible disorder

Area of Science:

• Gastroenterology
• Pathology

Background:

• Collagenous colitis is a condition characterized by a thickened subepithelial collagen band.
• The etiology and optimal treatment of collagenous colitis remain areas of active research.

Observation:

• A patient presented with symptoms consistent with collagenous colitis.
• Clinical recovery was achieved following a course of mepacrine hydrochloride therapy.

Findings:

• Post-treatment biopsies revealed persistent, albeit reduced, increases in reticulin fibers in the upper lamina propria.
• These microscopic findings indicate potential long-term histological changes despite clinical resolution.

Implications:

• Mepacrine hydrochloride may be a viable therapeutic option for collagenous colitis.
• Further research is warranted to understand the long-term histological implications of treatment and disease persistence.