Figure 3. (A,B) Hematoxylin and eosin (H&E) stained sections (100x) show bone with infiltrating squamous cells forming sheets and nests. The cells have abundant cytoplasm, moderately pleomorphic nuclei, and form "keratin pearls" (B). (C, D) Immunohistochemical staining (100x) for P40 (C) and Cytokeratin 5/6 (D) show positive staining.
