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Histopathologic examination. (A) Papillary and pestle-and-ball heterogeneous hyperplasia of squamous epithelium with koilocyte formation, chronic suppurative inflammation in some areas, and hyperplasia and dilatation of mammary ducts. (B) Squamous epithelial verrucous and papillomatous hyperplasia with some areas of carcinoma, carcinoma areas of highly differentiated squamous cell carcinoma with superficial mesenchymal infiltration of skin and soft tissues.
