1A) Infiltrating tumor mass forming nests and cords. 1B) Large, cohesive cells, with abundant glassy eosinophilic cytoplasm and well defined cell borders; focal keratinization. 1C) Focal tumor necrosis. 1D) Poorly differentiated cells with high grade nuclei infiltrating singly into the stroma.
Arva and Das Diagnostic Pathology 2011 6:46 doi:10.1186/1746-1596-6-46