World Health Organization classification of ovarian sex cord-stromal tumors
| Tumor type | |
| Pure stromal tumors | |
| Fibroma | 4% of all ovarian tumors8 |
| Cellular fibroma | |
| Thecoma | 0.5–1% of all ovarian tumors16 |
| Luteinized thecoma associated with sclerosing peritonitis | |
| Fibrosarcoma | |
| Signet ring stromal tumor | |
| Sclerosing stromal tumor | 5% of all sex cord stromal tumors7 |
| Microcystic stromal tumor | |
| Leydig cell tumor | |
| Steroid cell tumor | |
| Steroid cell tumor, malignant | |
| Pure sex cord tumors | |
| Adult granulosa cell tumor | 95% of all granulosa cell tumors68 |
| Juvenile granulosa cell tumor | 5% of all granulosa cell tumors68 |
| Sertoli cell tumor | |
| Sex cord tumors with annular tubules | 1.4% of all sex cord-stromal tumors81 |
| Mixed sex cord stromal tumors | |
| Sertoli–Leydig cell tumors | <0.5% of all ovarian tumors84 |
| Well differentiated | |
| Moderately differentiated | |
| With heterologous elements | |
| Poorly differentiated | |
| With heterologous elements | |
| Retiform | |
| With heterologous elements | |
| Sex cord-stromal tumor, not otherwise specified | |