Granulosa Cell Tumor of the Ovary, from the CureRays guide library.

Granulosa cell tumors are uncommon, usually slow-growing ovarian tumors that often make estrogen, are mostly cured by surgery when found early, and are known for sometimes coming back many years later — so long-term follow-up matters.

What it is.

Granulosa cell tumors are an uncommon kind of ovarian tumor that grow from the ovary's hormone-producing support cells (the 'granulosa' cells that normally surround a developing egg), rather than from egg cells themselves. They belong to the 'sex cord-stromal' family of ovarian tumors. Many of them make estrogen, which can cause symptoms that lead to the diagnosis — such as unusual vaginal bleeding, a return of bleeding after menopause, or, in young girls, early puberty. They tend to grow slowly and are usually found while still confined to one ovary, where surgery alone often cures them. A hallmark of this tumor is that it can recur years or even decades after the first treatment, so doctors follow patients for a long time, often using blood markers like inhibin B and anti-Müllerian hormone. The adult type carries a characteristic gene change (FOXL2) that helps pathologists confirm the diagnosis.

How radiation treats it.

Radiation damages the DNA inside cancer cells so they can no longer divide and survive, while normal cells are better at repairing themselves. For granulosa cell tumors, surgery is the main treatment and radiation plays only a limited, selective role — for instance, controlling an isolated area of recurrence or easing symptoms. When it is used, it is given as short, painless daily sessions and leaves no radioactivity in your body, so you remain safe to be around family and children.

The ways we can treat it.

Radiation (selective). Radiation is not a routine treatment for granulosa cell tumors; it is used in selected cases to control a specific area of recurrence or to relieve symptoms when surgery and other treatments are not enough.

Stereotactic / focused radiation. When recurrence shows up as one or a few isolated spots, precisely targeted high-dose radiation can control them while sparing nearby healthy tissue.

Palliative radiation. Short courses of radiation can ease pain, bleeding, or pressure symptoms from advanced, treatment-resistant disease.

Questions we hear often.

Can I still have children after treatment? Often yes. For young women with an early, one-sided tumor, surgeons can frequently remove only the affected ovary and fallopian tube, leaving the uterus and other ovary in place. Your team will tailor the plan to your age, stage, and wishes.

Why do I need follow-up for so many years? Granulosa cell tumors are known for coming back long after the first treatment — sometimes a decade or more later. Regular check-ups with blood markers like inhibin B and imaging help catch any recurrence early, when it is most treatable.

Why am I having unusual bleeding? Many of these tumors make estrogen, which can thicken the uterine lining and cause irregular bleeding or bleeding after menopause. This is often the symptom that leads to diagnosis, and it usually settles after the tumor is removed.

This guide is informational only. It is not medical advice — please confirm anything here with your care team.