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Histological features of microscopic colitis. Hematoxylin and eosin (A) and anti-CD3 (B) staining in lymphocytic colitis; black arrows indicate intraepithelial lymphocyte infiltration. Hematoxylin and eosin (C) and Masson’s Trichrome staining (D) in collagenous colitis; arrows point to the subepithelial collagen band. All images also show surface epithelial injury and lamina propria increased cellularity (original magnification: 40×).
