Figure 3. Histopathological examination illustrating an infiltrating malignant epithelial tumor consisting of small cells with scant cytoplasm and pleomorphic, hyperchromatic nuclei (10× H&E stain, A). The malignant nuclei showed prominent nuclear molding, and extensive necrosis suggestive of a poorly differentiated, small cell type E-NEC (40× H&E stain, B).
