or theca cell tumors
are benign ovarian neoplasms
composed only of theca cells
. Histogenetically they are classified as sex cord-stromal tumours
. They are typically estrogen
-producing and they occur in older women
(mean age 59; 84% after menopause
Grossly, the tumour appears solid and yellow, and tumour cells are large with abundant lipid-filled cytoplasm.
Sixty percent of patients present with abnormal uterine bleeding, and 20% have endometrial carcinoma.