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Histopathological sections of biopsy specimens. H&E staining in tumor cells (A), 4× magnification, the tumor was characterized by duct-like adenocarcinoma with tumor-like necrosis in the nest. H&E staining in tumor cells (B), 10× magnification, tumor cells showed pleomorphic nuclei, coarse, granular chromatin, visible nucleoli, and eosinophilic cytoplasm. H&E, hematoxylin and eosin.
