Microscopic colitis as a missed cause of chronic diarrhea

Figure 1 Lymphocytic colitis. A: Classic form. Colonic biopsy showing typical findings of diffuse increase in intraepithelial lymphocytes, mild inflammation with surface epithelial damage (H and E stain × 200); B: CD3 immunohistochemistry highlighting lymphocytes (× 200).

Figure 2 Lymphocytic colitis. A: Tangential colonic biopsy showing possible intraepithelial lymphocytes (H and E, original magnification × 200); B: The intra-epithelial lymphocytes are more prominent with CD3 immunostaining (× 200).