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(A) Circles surround epithelial nests. Asterisks indicate central keratinization. Black arrows point to areas of abrupt keratinization. (B) Arrow points to the area of necrosis. Asterisk indicates central keratinization. A circle surrounds an epithelial nest. (C) Arrows point to regions of frank atypia. (D) A circle surrounds the region with abnormal mitotic figures.
