Figure 2. Microscopic findings of the adrenocortical tumor. (A) On the low-power view, the tumor was composed of sheets of tumor cells, and tumor necrosis was observed (×100). (B) On the high-power view, the tumor cells of the adrenocortical carcinoma were pleomorphic and typified by atypical mitosis (arrows) (×200). (C-F) Immunohistochemical staining for (C) inhibin, (D) synaptophysin, (E) chromogranin, and (F) Ki67 (×400). The tumor cells were positive for inhibin and synaptophysin but negative for chromogranin.