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Cystic keratinizing epithelioma. Cystic structures consists of a highly irregular wall of highly keratinized stratified squamous epithelium, with a center filled with keratin. The wall has a thick complex proliferation of squamous epithelial outgrowths into surrounding alveolar spaces. PCB126 study, H&E, X33. Reprinted with permission from Toxicologic Pathology from Sells et al. 2007.
