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a Small-cell-type neuroendocrine carcinoma. The tumor cells are oval to spindle-shaped. The cells are arranged in ribbons. HE. ×40. b The tumor cells are immunoreactive to the neuroendocrine marker chromogranin. Immunohistochemical stain magnification, ×40. c The tumor cells show strong intranuclear positivity to ki-67 antibodies (> 90%). Immunohistochemical stain magnification, ×340.
