Thecoma

Thecoma
High magnification micrograph of a thecoma. H&E stain.
Classification and external resources
ICD-9-CM	220
ICD-O	8600
MeSH	D013798
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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 (mean age 59; 84% after menopause). (They can, however, appear before menopause.)

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

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.

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