title: Collagenous colitis: a cause of chronic diarrhea diagnosed only by biopsy of normal appearing colonic mucosa.
mesh_terms: D000368:Aged; D001706:Biopsy; D002908:Chronic Disease; D003092:Colitis / Q000150:complications* / Q000473:pathology; D003095:Collagen Diseases / Q000150:complications* / Q000473:pathology; D012809:Colon, Sigmoid / Q000473:pathology; D003113:Colonoscopy; D003967:Diarrhea / Q000209:etiology*; D005260:Female; D006801:Humans; D007413:Intestinal Mucosa / Q000473:pathology