Granulosa Cell Tumor: What It Is, Why It Happens, and How It's Treated
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer
A granulosa cell tumor is a rare, usually slow-growing ovarian tumor that often produces hormones [1]. Symptoms include abnormal vaginal bleeding, pelvic pain, abdominal swelling and breast tenderness [1] [2]. Adult cases are linked to a FOXL2 gene change [1] [4]. Treatment is surgery, sometimes including a hysterectomy [1]. The outlook is excellent if caught early, but lifelong monitoring is needed for recurrence [1].
What the research says
The outlook is very good, but relapse can come late. A systematic review of 60 articles reported a 5-year survival rate of 97%–98% for most women with adult GCT, yet recurrence can occur more than 20 years after diagnosis (Li et al., Acta Obstet Gynecol Scand, 2021) [3].
One gene change is found in almost all adult GCTs. The FOXL2 mutation was present in 86 of 89 additional adult-type GCTs (97%), but in only 1 of 10 juvenile-type GCTs (Shah et al., N Engl J Med, 2009) [4].
Fertility-sparing surgery can be a good option for young women. The same review found that young women who had fertility-sparing surgery had desirable reproductive and survival outcomes compared with those who had radical surgery (Li et al., Acta Obstet Gynecol Scand, 2021) [3].
What Is a Granulosa Cell Tumor?
A granulosa cell tumor (GCT) is a rare ovarian tumor that arises from granulosa cells [1]. These specific cells are responsible for producing essential hormones like estrogen and progesterone, which help egg cells mature and regulate the menstrual cycle. Healthcare providers may also refer to these as granulosa theca cell tumors [1].
Although most GCTs are malignant (cancerous), they tend to grow much more slowly than other types of ovarian cancer [1]. When diagnosed early—which happens in about 9 out of 10 cases—the outcomes are generally excellent [1]. However, because these tumors can produce excess hormones, they often cause noticeable changes in the body that serve as early warning signs.
Feature | Details |
Tumor Type | Sex cord-stromal tumor |
Primary Location | Ovaries |
Growth Rate | Usually slow-growing |
Hormone Activity | 70% produce excess estrogen |
Early Diagnosis Rate | ~90% of cases |
Types of Granulosa Cell Tumors
There are two distinct types of granulosa cell tumors, categorized by the age at which they typically appear and their behavior under a microscope.
Adult Granulosa Cell Tumors
This is the most common form of GCT. It typically develops in women who are going through perimenopause or are postmenopausal [1]. While they grow slowly, they have a unique tendency to return (recur) many years later—sometimes more than 20 years after the initial diagnosis [1] [3].
Juvenile Granulosa Cell Tumors
Representing only 5% of cases, this type occurs in females under the age of 30, including young girls who have not yet started puberty [1]. Juvenile GCTs can be more aggressive than the adult version if they spread outside the ovary, and they are more likely to return within a few years of treatment rather than decades [1].
What Are the Symptoms?
Symptoms of granulosa cell tumors are often caused by either the physical size of the tumor or the excess hormones it produces. High levels of estrogen are responsible for many of the most common signs.
Common Signs and Symptoms
Abnormal Bleeding: This includes irregular periods, no periods, or vaginal bleeding after menopause [1] [2].
Physical Mass: A bulge or mass in the lower abdomen that can be felt by hand [1].
Pain and Swelling: Abdominal pain, a swollen belly (distension), or breast tenderness [1].
Early Puberty: In young girls, a juvenile GCT can trigger precocious (early) puberty [1].
It is important to see a healthcare provider immediately if you experience sudden, severe abdominal pain. This could indicate a complication such as the tumor rupturing, the ovary twisting (torsion), or bleeding within the tumor itself [1].
Causes and Risk Factors
The exact reason why these tumors develop is not fully understood, but research has linked them to specific genetic changes. For more than 95% of adult GCTs, a mutation in the FOXL2 gene is present [1] [4]. This gene is supposed to help granulosa cells develop correctly [4], but the mutation causes them to grow abnormally.
Juvenile GCTs are also associated with genetic changes, such as having three copies of chromosome 12 (trisomy 12) instead of two [1]. There are no known environmental factors or lifestyle choices that can prevent these genetic mutations from occurring [1].
Diagnosis and Treatment
Healthcare providers typically use a combination of imaging and blood tests to diagnose a granulosa cell tumor [1].
Diagnostic Tools
Imaging: Pelvic ultrasound, CT scans, and MRIs are used to visualize the tumor and check its size [1] [2].
Blood Tests: Providers look for specific “tumor markers” and check hormone levels, such as estrogen and anti-Müllerian hormone (AMH) [1] [2].
Staging: During surgery, doctors determine the “stage” of the cancer. Stage I means the tumor is confined to the ovaries, while Stages II through IV indicate the cancer has spread to other parts of the body [1].
Treatment Paths
Surgery is the primary treatment for GCT [1] [2]. The goal is to remove the tumor while preserving as much healthy tissue as possible.
Standard Surgery: Often involves a hysterectomy (removal of the uterus) and the removal of both ovaries [1] [2].
Fertility-Sparing Surgery: For those who wish to have children, doctors may remove only the affected ovary (oophorectomy), leaving the uterus and the healthy ovary intact [1] [2].
Additional Treatments: If the cancer has spread or returns, chemotherapy, hormone therapy, or radiation therapy may be recommended [1].
Frequently Asked Questions
Q: Is a granulosa cell tumor always cancerous?
A: Most GCTs are considered malignant (cancerous), but they are usually slow-growing and have a high cure rate when caught early.
Q: Can I still have children after treatment?
A: In many cases, yes. If the tumor is caught early and is only in one ovary, surgeons can often perform fertility-sparing surgery.
Q: Why do I need follow-up for so many years?
A: Adult GCTs are known for “late recurrence,” meaning they can come back 10, 20, or even 30 years after your first treatment.
Q: What is the most common symptom?
A: Abnormal vaginal bleeding (including postmenopausal bleeding) is one of the most frequent symptoms due to the excess estrogen produced by the tumor.
Q: How rare are these tumors?
A: They are very rare, accounting for only about 2% to 5% of all ovarian tumors.
Q: Does high estrogen cause the tumor?
A: No, the tumor itself produces the high estrogen, which then causes symptoms like breast tenderness and bleeding.
Q: What is the FOXL2 gene?
A: It is a gene that helps granulosa cells in the ovaries develop. A mutation in this gene is found in nearly all adult GCT cases.
Q: Can a GCT be prevented?
A: There is currently no known way to prevent the genetic mutations that cause these tumors.
Q: Is chemotherapy always necessary?
A: No. For Stage I tumors that are completely removed by surgery, additional treatment like chemotherapy is often not required.
Q: What is the survival rate?
A: The outlook is very good, especially for the 90% of patients diagnosed at Stage I. However, recurrence can be serious, which is why monitoring is vital.
Q: Can these tumors occur in both ovaries?
A: It is possible, but they usually start in just one ovary.
Q: What is an adnexal mass?
A: This is a general term for a mass found near the uterus, which can include a granulosa cell tumor.
Q: How does a doctor check for recurrence?
A: Doctors typically use regular pelvic exams and blood tests to look for tumor markers that might indicate the cancer has returned.
Q: Are GCTs related to other types of ovarian cancer?
A: They are a type of “sex cord-stromal tumor,” which is different from the more common “epithelial” ovarian cancers.
Q: Can these tumors cause infertility?
A: Yes, the excess hormones produced by the tumor can interfere with normal ovulation and lead to infertility.
Related Reading
Anti-Müllerian Hormone (AMH) Test: Normal Levels by Age and What Results Mean explains how AMH estimates ovarian reserve and what results mean.
Sources
Cleveland Clinic Staff. Granulosa Cell Tumor. Cleveland Clinic. Last updated March 18, 2026. https://my.clevelandclinic.org/health/diseases/24245-granulosa-cell-tumor
Cancer Research UK. Sex cord stromal tumours. Cancer Research UK. Last reviewed November 27, 2024. https://www.cancerresearchuk.org/about-cancer/ovarian-cancer/types/sex-cord-stromal
Li J, et al. Progress in the management of ovarian granulosa cell tumor: A review. Acta Obstet Gynecol Scand. 2021;100(10):1771-1778. PMID 34027996. https://doi.org/10.1111/aogs.14189
Shah SP, et al. Mutation of FOXL2 in granulosa-cell tumors of the ovary. N Engl J Med. 2009;360(26):2719-29. PMID 19516027. https://doi.org/10.1056/NEJMoa0902542
Shamsudeen S, Dunton CJ. Granulosa Theca Cell Tumors of the Ovary. In: StatPearls [Internet]. StatPearls Publishing. Last updated November 12, 2023. https://www.ncbi.nlm.nih.gov/books/NBK565872/
Mayo Clinic Staff. Ovarian cancer: Symptoms and causes. Mayo Clinic. May 2, 2025. https://www.mayoclinic.org/diseases-conditions/ovarian-cancer/symptoms-causes/syc-20375941
Medical disclaimer
This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have about a medical condition. Never disregard professional medical advice or delay seeking care because of something you have read here. If you think you may have a medical emergency, call your doctor or emergency services immediately.
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