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A 58-year-old female with left primary neuroendocrine carcinoma of the breast. Left breast lumpectomy with sentinel lymph node dissection. (A) Low magnification hematoxylin and eosin stain demonstrates nests and solid sheets of cells with rounded margins separated by fibrovascular stroma. Positive immunohistochemistry shown above includes the following: (B) synaptophysin and (C) chromogranin.
