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(A) Well-circumscribed tumor composed of small, round cells. They are arranged in trabeculae, cords, and nests along with the hepatic parenchyma. (B) Higher power reveals round to oval cells with central nuclei having salt-and-pepper–like chromatin in a fine vascular network. (C) Tumor cells displaying the Ki-67 index of less than 2%. (D) Tumor cells showing diffuse cytoplasmic positivity for chromogranin. (E) Tumor cells showing diffuse cytoplasmic positivity for synaptophysin.
