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Keratoacanthoma : Sweat Duct Proliferation

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Some cases of keratoacanthoma show reactive proliferation of sweat glands. The right half of this image shows a focus of sweat duct hyperplasia. The left half shows numerous clusters of well-differentiated keratinizing squamous epithelium. One of the squamous nests near the bottom has a neutrophilic microabscess (see higher magnification in the next image).

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