PMC6295307_01
HE stain x 400: Thick collagenous subepithelial band. Detachment of the overlying epithelium. Inflammatory infiltrate in the lamina propria
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The overlying epithelium was focally detached (Figure 1).
Trichrome stain: thick subepithelial collagenous band
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A trichrome stain confirmed the collagenous nature of the band (Figure 2).