Table 2.

Former WHO classification scheme for ovarian sex cord-stromal tumors (2003)

Granulosa-stromal cell tumors ○ Granulosa cell tumor group Adult granulosa cell tumor Juvenile granulosa cell tumor ○ Thecoma-fibroma group Thecoma, NOS - Typical - Luteinized Fibroma Cellular fibroma Fibrosarcoma Stromal tumor with minor sex cord elements Sclerosing stromal tumor Signet-ring stromal tumor Unclassified (fibrothecoma)

Sertoli-stromal cell tumors ○ Sertoli-Leydig cell tumors group (androblastoma) Well-differentiated Of intermediate differentiation - variant with heterologous elements Poorly differentiated (sarcomatoid) - variant with heterologous elements Retiform - variant with heterologous elements ○ Sertoli cell tumor ○ Stromal-Leydig cell tumor

Sex cord-stromal tumors of mixed or unclassified cell types ○ Sex cord tumor with annular tubules ○ Gynandroblastoma ○ Sex cord-stromal tumor, unclassified

Steroid cell tumors ○ Stromal luteoma ○ Leydig cell tumor group Hilus cell tumor Leydig cell tumor, non-hilar type Leydig cell tumor, NOS ○ Steroid cell tumor, NOS Well-differentiated Malignant

WHO, World Health Organization; NOS, not otherwise specified.