Thecoma

Thecomas 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.
60% of patients present with abnormal uterine bleeding, and 20% have endometrial carcinoma.

Pathologic features

Image:Thecoma low mag.jpg|thumb|left|Low magnification micrograph of a thecoma showing compression of the ovarian cortex. H&E stain.
Grossly, the tumour is solid and yellow.
Grossly and microscopically, it consists of the ovarian cortex.
Microscopically, the tumour cells have abundant lipid-filled cytoplasm.