Fig. 3

Pathologic and immunohistochemical image of the pituitary neuroendocrine tumor. A, H&E staining shows typical pituitary neuroendocrine tumor cells (×200). B, GH was moderately positive. C, PIT-1 was strongly positive. D, PRL was scattered and focal positive. E, ki-67 proliferative activity was approximately 1%. F, CAM5.2 was in a sparsely granulated pattern