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(A) Normal colonic mucosa. (B) Characteristic findings of collagenous colitis: detached and damaged epithelial cells (a), lamina propria inflammation (b), and thickened collagen layer (c). (C) Characteristic findings of lymphocytic colitis: epithelial cell damage with intraepithelial lymphocytosis (a) and inflammation in the lamina propria (b). Hematoxylin and eosin (HE) staining.
