Collagenous colitis and Crohn's disease: Guilty or innocent bystander?

The authors report a case of a 73-year-old male evaluated for profuse watery diarrhea and weight loss for 2 months, aggravated the week before. His past medical history was relevant for ileal Crohn's disease diagnosed at the age of 34 years, with two segmental enterectomies due to ileal stenosis and enterocutaneous fistula. The histopathological exam of the resected bowel showed transmural lymphoplasmocytic infiltrate with deep ulceration and non-caseating granulomas. Due to penetrating phenotype, immunomodulatory therapy was proposed but the patient refused.

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