Thecoma

**Definition:** A gonadal stromal neoplasm composed only of THECA CELLS, occurring mostly in the postmenopausal OVARY. It is filled with lipid-containing spindle cells and produces ESTROGENS that can lead to ENDOMETRIAL HYPERPLASIA; UTERINE HEMORRHAGE; or other malignancies in postmenopausal women and sexual precocity in girls. When tumors containing theca cells also contain FIBROBLASTS, they are identified as thecoma-fibroma tumors with less active hormone production.

**Tree numbers:** - C04.557.475.750.875 - C04.588.322.455.765 - C12.050.351.500.056.630.705.765 - C12.050.351.937.418.685.765 - C12.100.250.056.630.705.765 - C12.900.418.685.765 - C19.344.410.765 - C19.391.630.705.765

**Synonyms:** - Theca Cell Tumor