Fig. 2. High-power view of H&E staining shows small- to medium-sized neoplastic cells with lobulation. Necrosis and mitosis are not seen. Immunohistochemistry (IHC) staining for various cell markers revealed positive staining for adrenocorticotropic hormone (ACTH), neuron-specific enolase (NSE), and chromogranin A and negative staining for T-Pit. (A) H&E ×200, (B) ACTH-IHC ×200, (C) NSE-IHC ×200, (D) Chromogranin A-IHC ×200, and (E) T-Pit-IHC ×200.