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Small-sized tumor cells with high nuclear cytoplasmic ratio grow in a nested pattern with focal peripheral palisading (hematoxylin and eosin, original magnifications ×400, (A) Immunohistochemical analysis shows high Ki-67 labeling index values (74%) (B), and diffuse positivity of chromogranin A (C) and synaptophysin (D) (original magnifications ×400).
