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Photomicrographs. A) The mass was composed of a neoplastic population of small, bland epithelial cells with round nuclei, finely granular chromatin, and small nucleoli, which primarily formed an insular architectural pattern with nests of cells admixed with small acini (H & E, orig. ×400). B) The neoplastic cells uniformly expressed chromogranin and synaptophysin (immunohistochemical stain, orig. ×400).
