Health condition
Fibrous dysplasia
Fibrous dysplasia replaces areas of normal bone with weak fibrous tissue, causing pain, deformity and fractures in one bone or many - caused by a mosaic GNAS mutation acquired before birth, so it is genetic but not inherited.
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.
Which gene and test confirm it, who should be tested in the family, and which specialist to see.
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Caused by a post-zygotic (mosaic) activating GNAS mutation - not passed to children
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Monostotic (one bone) disease is commonest and often found incidentally; polyostotic disease favours the skull, femur and ribs
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Diagnosis usually rests on characteristic imaging ('ground glass' appearance); biopsy or mutation testing for atypical cases
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Management: bone pain often responds to bisphosphonates; surgery corrects deformity and fixes fractures; check for endocrine features of McCune-Albright
Understanding the condition
What it is and what happens next.
What causes it, how it is confirmed, and the testing and specialist routes available in the UK.
What it is and how it presents
Fibrous dysplasia begins with a single cell early in development acquiring a GNAS mutation; everything descended from that cell builds disorganised, under-mineralised bone, which is why the disease maps to patches rather than the whole skeleton. An adult may discover a lesion incidentally on an X-ray taken for something else, or present with deep bone ache, a stress fracture through weakened bone, or the slowly bowing 'shepherd's crook' femur of larger lesions.
Testing, surveillance and specialist care
Assessment at a centre familiar with the condition sorts out extent (bone scan or whole-body imaging), excludes the rare associated endocrine syndromes, and matches treatment to symptoms - from monitoring alone through bisphosphonates for pain to prophylactic fixation of high-risk femoral lesions. Because the mutation is mosaic, children of affected people are not at increased risk, a point worth hearing from a specialist directly. NHS clinical genetics services carry some of the longest waits in the health service, often many months for a first appointment, whereas private genetic testing and a specialist review can typically be arranged within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a endocrinologist or orthopaedic surgeon at a specialist bone centre. 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 emergency symptoms.
Frequently asked
Common questions about Fibrous dysplasia.
Quick, plain-English answers to what people ask us most.
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What is fibrous dysplasia?
Fibrous dysplasia is a diagnosis used by clinicians to describe a specific pattern of symptoms or findings. It's usually confirmed after a proper assessment, since several conditions can look similar at first.
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Why does fibrous dysplasia happen?
Fibrous dysplasia can arise from several different underlying mechanisms, and in many cases more than one factor contributes. Identifying likely causes usually forms part of the initial specialist work-up.
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How would I know if I have fibrous dysplasia?
Symptoms of fibrous dysplasia vary from person to person and can range from mild and easily missed to significant enough to affect daily life. Because overlapping conditions can produce similar symptoms, a clinical assessment is the most reliable way to confirm what's actually going on.
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Can fibrous dysplasia cause complications?
Most cases of fibrous dysplasia are manageable with appropriate care, though, like many conditions, it can occasionally lead to complications if left unassessed or untreated. Your clinician can give you a realistic sense of the risks based on your specific presentation.
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Is fibrous dysplasia hereditary?
In most cases fibrous dysplasia isn't straightforwardly inherited, though family history can sometimes be a relevant background factor. A clinician can help you understand whether it's worth mentioning relatives' health when being assessed.
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Is there a cure for fibrous dysplasia?
Fibrous dysplasia can often be managed effectively, and in some cases prevented or reversed, with the right combination of lifestyle changes, medication or other targeted treatment. A specialist will tailor the approach to your circumstances rather than applying a one-size-fits-all plan.
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How is fibrous dysplasia treated?
Treatment for fibrous dysplasia is usually built around the severity of your symptoms and any underlying cause found on assessment, and may involve lifestyle measures, medication, physiotherapy or, in some cases, a procedure. Your specialist will discuss the pros and cons of each option with you before agreeing a plan.
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What's the outlook for fibrous dysplasia?
The outlook for fibrous dysplasia varies widely depending on the underlying cause, how early it's diagnosed, and how it responds to treatment. Many people see significant improvement with appropriate care, and your specialist can give you a more personalised timeframe once they've reviewed your case.
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Could fibrous dysplasia be confused with another condition?
Because several conditions can share similar symptoms to fibrous dysplasia, clinicians often consider a short list of possibilities before confirming a diagnosis. This is one of the main reasons a proper assessment, and sometimes targeted tests, matters more than relying on symptoms alone.
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When should I see a doctor about fibrous dysplasia, and how quickly can I be seen privately?
It's worth seeking medical advice if symptoms of fibrous dysplasia are persistent, worsening, or affecting your daily life, rather than waiting for them to resolve on their own. NHS routine referrals for this kind of assessment can take anywhere from around 20 to 45+ weeks, whereas private consultants typically offer an appointment within about two weeks.