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# Other sex cord–stromal tumours

- Lesion

Solid ovarian tumours of the supporting cells: fibromas can bring ascites and pleural fluid, and Sertoli–Leydig tumours can make a woman's body more masculine.

Updated Nov 12, 2026

## Key points

- Fibroma: solid, hard, white tumour of fibroblasts; benign; Meigs syndrome (fibroma, ascites, usually right-sided hydrothorax) resolves after removal.
- Bilateral fibromas in young women: nevoid basal cell carcinoma (Gorlin) syndrome, PTCH1.
- Thecoma: yellow tumour of plump lipid-rich theca cells; estrogenic; postmenopausal women.
- Sertoli–Leydig cell tumour: tubules of Sertoli cells with Leydig cells; androgens cause defeminisation then virilisation; DICER1 mutations (germline DICER1 syndrome with pleuropulmonary blastoma).
- Steroid cell tumours (including hilus Leydig cell tumour with Reinke crystals): virilising.
- Gonadoblastoma: germ cells and sex cord cells in a dysgenetic gonad with a Y chromosome; can give rise to dysgerminoma.

On this page

- The basics Key points
- What it is
- Structure
- Step by step
- Sex cord–stromal tumours and their hormones
- Markers
- Memory aid
- Elsewhere in DurgiPedia

- Clinical Clinical notes

- Study Test yourself

- Connections Connections

## What it is

Besides granulosa cell tumours, the sex cord–stromal family includes fibromas, thecomas, Sertoli–Leydig cell tumours and steroid cell tumours. Fibromas are benign, hormonally inactive tumours of ovarian stromal fibroblasts, sometimes accompanied by ascites and a right pleural effusion (Meigs syndrome). Thecomas are made of lipid-laden cells that secrete estrogen. Sertoli–Leydig cell tumours of young women secrete androgens and are linked to DICER1 mutation. Gonadoblastoma arises in dysgenetic gonads with a Y chromosome.

## Structure

- Fibroma: interlacing bundles of bland spindle cells with collagen; can be large.
- Thecoma: sheets of round to oval cells with pale vacuolated cytoplasm; yellow cut surface from lipid.
- Sertoli–Leydig: solid or tubular growth of Sertoli-like cells, with clusters of Leydig cells with eosinophilic cytoplasm; poorly differentiated types are more aggressive.
- Gonadoblastoma: nests of large germ cells and small sex cord cells around hyaline deposits, often calcified.

## Step by step

- Ovarian stromal and sex cord cells can follow female (granulosa, theca) or male (Sertoli, Leydig) lines.
- A tumour keeps the hormone program of its cell type: theca cells make estrogen, Leydig cells make androgen.
- Hormones act on target tissues: endometrium and breast with estrogen, hair follicles, voice and clitoris with androgen.
- Fibromas make no hormones but can leak fluid into the peritoneum, which crosses the diaphragm into the pleura (Meigs).

## Sex cord–stromal tumours and their hormones

| Tumour | Typical age | Hormone | Clue |
| --- | --- | --- | --- |
| [Adult granulosa cell tumour](https://durgical.com/en/conditions/ovarian-germ-cell-and-sex-cord-stromal-tumours/) | Peri- and postmenopausal | Estrogen, inhibin | Call–Exner bodies, FOXL2 |
| [Juvenile granulosa cell tumour](https://durgical.com/en/conditions/ovarian-germ-cell-and-sex-cord-stromal-tumours/) | Children and young women | Estrogen | Precocious puberty |
| Thecoma | Postmenopausal | Estrogen | Yellow, lipid-rich cells |
| Fibroma | Middle-aged and older | None | Meigs syndrome, Gorlin syndrome |
| [Sertoli–Leydig cell tumour](https://durgical.com/en/conditions/ovarian-germ-cell-and-sex-cord-stromal-tumours/) | Young women | Androgen | Virilisation, DICER1 |
| Steroid cell tumour | Adults | Androgen (sometimes estrogen or cortisol) | Reinke crystals in Leydig type |

## Markers

- Inhibin and calretinin
- SF1
- DICER1 testing

## Clinical notes

- New hirsutism, deepening voice, clitoral enlargement and amenorrhea in a young woman with an adnexal mass suggest a Sertoli–Leydig cell tumour.
- Ascites with a pleural effusion and a solid ovarian mass can mimic ovarian cancer; with a fibroma it disappears after removal.
- Patients with DICER1-associated tumours and their families are offered genetic counselling.

## Memory aid

Fibroma floods (ascites and pleura), thecoma feminises, and Sertoli–Leydig makes a beard.

## Test yourself

Think of the answer, then tap the question to see it.

## What is Meigs syndrome?

An ovarian fibroma with ascites and a pleural effusion, usually right-sided, which resolve after the tumour is removed.

## Which ovarian tumour causes virilisation in a young woman and is linked to DICER1?

The Sertoli–Leydig cell tumour.

## In which patients does gonadoblastoma arise?

In dysgenetic gonads that contain a Y chromosome, where it can progress to dysgerminoma.

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## Elsewhere in DurgiPedia

- [The adrenal cortex: zones, hormones and androgens](https://durgical.com/en/physiology/the-adrenal-cortex-zones-hormones-and-androgens/)
- [Steroid hormone synthesis (overview)](https://durgical.com/en/biochemistry/topics/steroid-hormone-synthesis/)
- [Differences of sex development: CAH, AIS and 5α-reductase](https://durgical.com/en/embryology/differences-of-sex-development-cah-ais-and-5-reductase/)

## Connections

## Related 6

- [Granulosa cell tumours: adult and juvenile](https://durgical.com/en/general-pathology/granulosa-cell-tumours-adult-and-juvenile/)
- [Ovarian tumours: classification](https://durgical.com/en/general-pathology/ovarian-tumours-classification/)
- [Malignant ovarian germ cell tumours](https://durgical.com/en/general-pathology/malignant-ovarian-germ-cell-tumours/)
- [Non-neoplastic ovarian cysts and polycystic ovaries](https://durgical.com/en/general-pathology/non-neoplastic-ovarian-cysts-and-polycystic-ovaries/)
- [Non-germ cell testicular tumours](https://durgical.com/en/general-pathology/non-germ-cell-testicular-tumours/)
- [Edema and effusions: the four mechanisms](https://durgical.com/en/general-pathology/edema-and-effusions-the-four-mechanisms/)

## Related conditions 5

- [Ovarian germ-cell and sex cord–stromal tumours](https://durgical.com/en/conditions/ovarian-germ-cell-and-sex-cord-stromal-tumours/)
- [Pleural effusion](https://durgical.com/en/conditions/pleural-effusion/)
- [Turner syndrome](https://durgical.com/en/conditions/turner-syndrome/)
- [Basal cell carcinoma](https://durgical.com/en/conditions/basal-cell-carcinoma/)
- [Androgen insensitivity syndrome](https://durgical.com/en/conditions/androgen-insensitivity-syndrome/)

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Educational content on the mechanisms of disease; not a diagnostic or treatment guide and no substitute for a health professional's advice. No doses are given.

Sources: [DICER1 syndrome: MedlinePlus Genetics](https://medlineplus.gov/genetics/condition/dicer1-syndrome/) (MedlinePlus, US National Library of Medicine, 2026); [Ovarian Cyst](https://www.ncbi.nlm.nih.gov/books/NBK560541/) (StatPearls (NCBI Bookshelf), 2026).

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Representative model, for educational purposes only.

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