Microscopic findings for ovaries (a–d) and the sigmoid colon (e, f). (a, b) The papillary tumors of both ovaries were lined by tall columnar mucinous and ciliated serous cells. (c) The clear cell tumors had clear cytoplasm and a hobnail-shaped appearance. (d) Small clusters of clear cell tumor cells with nuclear atypia were surrounded by desmoplastic stroma. (e) The nodular colonic lesion was composed of dilated endometrioid glands. (f) Focal atypical glands with some papillary structure and nuclei.