Table 4 Previous and new WHO classification.
| Previous | New (2014) |
|---|---|
| Serous tumors | |
| Benign type | |
| Cystadenoma | cystadenoma |
| Papillary cystadenoma | adenofibroma |
| Surface papilloma | surface papilloma |
| Adenofibroma and cystadenofibroma | |
| Borderline (SBOT) | |
| Papillary cystic BOT | serous BOT/atypical proliferating tumor |
| Papillary surface BOT | SBOT, micropapillary type/non-invasive, serous low-grade carcinoma |
| Adenofibromatous and cystadenofibromatous BOT | |
| Malignant type | |
| Adenocarcinoma | serous low-grade carcinoma |
| Papillary surface carcinoma | serous high-grade carcinoma |
| Adenocarcinofibroma | |
| Mucinous tumors | |
| Benign type | |
| Cystadenoma | cystadenoma |
| Adenofibroma and cystadenofibroma | adenofibroma |
| Mucinous cystic tumor with mural nodules | |
| Mucinous cystic tumor with pseudomyxoma peritonei | |
| Borderline (MBOT) | |
| Intestinal type | mucinous BOT/atypical proliferating mucinous tumor |
| Endocervical type | |
| Malignant type | |
| Adenocarcinoma | mucinous carcinoma |
| Adenocarcinofibroma (malignant adenofibroma) | |
| Endometrioid tumors | |
| Benign type | |
| endometriosis cyst | |
| Cystadenoma | endometrioid cystadenoma |
| Adenofibroma & cystadenofibroma | endometrioid cystadenofibroma |
| Borderline (EBOT) | |
| Cystic tumor | endometrioid EBOT/atypical proliferative endometrioid tumor |
| Adenofibroma and cystadenofibroma | |
| Malignant type | |
| Adenocarcinoma NOS | endometrioid carcinoma |
| Adenocarcinofibroma (malignant adenofibroma) | |
| Malignant Müllerian mixed tumor (carcinosarcoma) | |
| Adenosarcoma | |
| Endometrioid stromal sarcoma (low-grade) | |
| Undifferentiated ovarian sarcoma | |
| Clear cell tumors | |
| Benign type | |
| Cystadenoma | cystadenoma |
| Adenofibroma and cystadenofibroma | |
| Borderline (KBOT) | |
| Cystic tumor | CBOT/atypical proliferating clear cell tumor |
| Adenofibroma and cystadenofibroma | |
| Malignant type | |
| Adenocarcinoma | clear cell tumor |
| Adenocarcinofibroma (malignant adenofibroma) | |
| Transitional cell tumors | Brenner tumors |
| Benign type | |
| Brenner tumor | Brenner tumor |
| Metaplastic type | |
| Borderline | |
| Borderline Brenner tumor | borderline Brenner tumor/atypical proliferating Brenner tumor |
| Proliferative type | |
| Malignant type | |
| Transitional cell carcinoma | |
| Malignant Brenner tumor | malignant Brenner tumor |
| seromucinous tumors | |
| benign tumors | |
| seromucinous cystadenoma | |
| seromucinous adenofibroma | |
| borderline tumors | |
| seromucinous borderline tumor/atypical proliferating seromucinous tumor | |
| malignant disease | |
| seromucinous carcinoma | |
| Squamous epithelial tumors | |
| Mixed epithelial tumors | |
| Undifferentiated and unclassifiable tumors | Undifferentiated carcinoma |