PMC5443992_01
A well-circumscribed, dome, or cup-shaped central crater filled with keratin.
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fig1
Histologic examination of the lesion revealed a well-circumscribed, dome-shaped central crater filled with keratin (Figure 1).
Pushing, noninfiltrating margin of squamous epithelium.
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fig2
A pushing margin of squamous epithelium was seen; however, it was noninfiltrating distinguishing it from squamous cell carcinoma (Figure 2).
Well-differentiated squamous epithelium with ground-glass cytoplasm without atypia, dysplasia, or viral cytopathic effect.
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fig3
Well-differentiated squamous epithelium was observed with ground-glass cytoplasm (Figure 3), with no atypia, dysplasia, or viral cytopathic effect.
Intraepithelial microabscesses.
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fig4
Intraepithelial microabscesses were also present (Figure 4).