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  • Title: Infundibular and trichilemmal keratinization of a pilar tumor.
    Author: Patterson JW.
    Journal: Cutis; 1985 Oct; 36(4):330-2. PubMed ID: 2415304.
    Abstract:
    Microscopic examination of a cystic epithelial tumor removed from the elbow of a 52-year-old man showed islands of epithelium undergoing keratinization without formation of a visible granular cell layer, as occurs within the follicular isthmus, in trichilemmal cysts, and in pilar tumors (proliferating trichilemmal cysts). Other areas showed keratinization with the formation of a distinct, even prominent, granular cell layer, as seen within the follicular infundibulum and in epidermal cysts. Possible modes of origin and relationships among these tumors and epidermal cysts are presented.
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