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The histological features of the lesion revealed pituitary metastasis of lung neuroendocrine. (A) Hematoxylin and eosin (H&E) staining revealed a solid tumor involving the pituitary gland, characterized by small cells with high-grade nuclear atypia and fibrosis (×400); (B–E) Immunohistochemistry revealed positivity for TTF-1(B), CK(C), Syn(D), and CgA(E) (×400); (F) Immunohistochemical staining of Ki-67 (×400).
