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Thecomas are benign tumours that are part of the sex cord-stromal tumour group of ovarian carcinomas. They are typically estrogen-producing and they occur in older women (mean age 59; 84% after menopause). They are solid and yellow. The tumour cells are large with abundant lipid-filled cytoplasm. Sixty percent of patients present with uterine bleeding, and 20% have endometrial carcinoma.