Collagenous Colitis : Trichrome
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![Colon_Colitis_Collagenous_Trichrome_Pathorama3_resized.jpg](/slides-13/slides/Colon_Colitis_Collagenous_Trichrome_Pathorama3_resized.jpg)
Comments:
A trichrome stain is useful in highlighting the thickened subepithelial collagen layer (black arrows) in collagenous colitis. The stain also shows its irregular lower border – a feature not seen with normal basement membrane. The red arrow points to intraepithelial lymphocytes. Image copyright: pathorama.ch.