PMC9021462_01
Biopsies showed a thick subepithelial collagen band with secondary surface epithelial stripping involving stomach (A and B), right colon (C), transverse colon (D), left colon (E) and rectum (F). Panel B shows a trichrome stain that stains collagen blue, whereas the other panels are hematoxylin-eosin stains (all at 200x magnification).
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PMC9021462_01_10.1177_2333794X221094262-fig1.jpg
fig1-2333794X221094262
Gastric biopsies revealed collagenous gastritis confirmed by trichrome stain and colonic biopsies demonstrated diffuse evidence of collagenous colitis involving right, transverse, left colon, and rectum (Figure 1).