Health condition
Struma ovarii
Struma ovarii is a rare ovarian tumour composed largely of thyroid tissue - usually benign, occasionally hormone-producing or malignant - typically discovered as an ovarian mass and cured by surgical removal.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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A form of ovarian teratoma in which thyroid tissue dominates
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Most present as a pelvic mass or incidental scan finding; a small minority cause genuine hyperthyroidism
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Suspect it when thyrotoxicosis exists with a quiet, low-uptake thyroid gland in the neck
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Diagnosis is confirmed by histology after surgical removal of the ovarian mass
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Malignant struma ovarii is rare and managed like thyroid cancer, with thyroidectomy and radioiodine in selected cases
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
Ovarian teratomas can contain any tissue, and occasionally thyroid tissue takes over the whole tumour. Most behave like any other benign ovarian mass - found on ultrasound during investigation of bloating, pelvic discomfort or by chance. The endocrine curiosity is the small subset that secretes: a woman with clear thyrotoxicosis, suppressed TSH, but a neck gland that is impalpable and shows negligible uptake on nuclear imaging may have her overactive thyroid sitting in her pelvis.
Diagnosis and treatment routes
Workup combines pelvic MRI or expert ultrasound, tumour markers, thyroid function and - in the hormone-producing scenario - whole-body uptake imaging that lights up the pelvis. Treatment is surgical removal, usually fertility-sparing oophorectomy or cystectomy, which is curative for benign disease; the rare malignant cases add thyroidectomy and radioiodine so surveillance with thyroglobulin becomes possible. An unexplained ovarian mass warrants prompt gynaecological review; private gynaecology appointments are typically available within about two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant gynaecologist, jointly with endocrinology. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Struma ovarii.
Quick, plain-English answers to what people ask us most.
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What does struma ovarii mean?
Struma ovarii is a medical condition that can affect people differently depending on severity, underlying cause and overall health. A clinician can confirm the diagnosis and explain what it means specifically for you.
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What are the risk factors for struma ovarii?
Causes vary and can include genetic, environmental, lifestyle and other health-related factors, and in some people no single clear cause is found. Your clinician can help identify anything relevant to your own case.
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What are the symptoms of struma ovarii?
Symptoms vary between individuals and depend on which body systems are affected and how significant the underlying problem is. Keeping track of what you notice, and when, helps your clinician assess it accurately.
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Is struma ovarii serious or dangerous?
Severity varies from mild and self-limiting to more significant, depending on the underlying cause and how it's managed. A clinical assessment is the best way to understand what it means in your specific situation.
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Is struma ovarii hereditary or genetic?
This depends on the specific condition — some cases have a genetic or familial component, while others are linked more to environmental, lifestyle or other health factors. If you have a relevant family history, it's worth mentioning to your clinician.
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Can struma ovarii be cured, reversed or prevented?
Many cases can be effectively treated or managed, and prevention strategies exist for some causes, though this depends on the specific underlying reason in your case. Your clinician can explain what's realistic for you.
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What treatment options are available for struma ovarii?
Treatment is tailored to the underlying cause and severity, and can range from simple lifestyle or self-management measures to medical or specialist intervention.
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How long does struma ovarii last, or take to recover from?
This varies depending on the underlying cause, how early it's identified, and how well it responds to treatment — your clinician can give a more specific expectation once assessed.
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When should specialist referral be considered for struma ovarii?
Specialist referral is worth considering if symptoms persist, are getting worse, or aren't responding to initial treatment — your GP can help decide the right pathway and urgency.
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When should I see a doctor about struma ovarii, and how quickly can I be seen privately?
See a doctor if symptoms are persistent, worsening, or affecting your daily life — earlier assessment generally leads to better management. NHS routine referrals for this kind of concern often take 20–45 weeks or longer depending on the area, while a private consultant can typically see you within about 2 weeks, with faster access to scans and specialist opinion.