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(A) Histopathology findings of tissue sampled during the first operation (HE staining) showing (B) no staining for ACTH and (C) a Ki-67 proliferation index of approximately 3% (magnification ×200): (D) histopathology findings of tissue sampled during the 4th operation (HE staining) showing (E) strong staining for ACTH, and (F) a Ki-67 proliferation index of approximately 2% (magnification ×200). ACTH = adrenocorticotropic hormone, HE = hematoxylin–eosin.
