Collagenous Colitis : Trichrome
Image Description
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.
Image copyright: pathorama.ch.