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Atypical cellular proliferation with clear cytoplasm and large hyperchromatic nuclei arrangement in the basal lamina of the epidermis and epidermotropism towards the upper rows of the epidermis (H&E (a) ×100, (b) ×200, and (c) ×400). (d) Positive staining for epithelial membrane antigen (EMA) in the immunohistochemical staining (×400).
