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(A) Microscopic low-power view showing brain parenchyma infiltrated by carcinoma and extensive areas of necrosis (H&E, × 40). (B) Medium-power view showing tumor forming glandular structures and a pseudopapillary arrangement of the tumor cells (H&E, × 200). (C) High-power view showing highly pleomorphic tumor cells and one atypical tetra-polar mitotic figure (blue arrow, H&E, × 400). (D) Tumor cells with positive cytokeratin-7 immunohistochemical stain (CK7, × 200).
