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Health condition

CADASIL

CADASIL is the most common inherited small vessel disease of the brain, causing migraine with aura, recurrent strokes and cognitive decline - a NOTCH3 gene diagnosis with real management implications.

Key points

What matters most, at a glance.

The essentials in plain English - symptoms, when to seek help, who to see and what treatment looks like.

  • Caused by NOTCH3 gene variants; dominantly inherited - each child of a carrier has a 50% chance

  • Typical sequence: migraine with aura from the 20s-30s, lacunar strokes from the 40s-50s, gradual cognitive and mood changes

  • MRI shows extensive white matter disease, characteristically involving the anterior temporal poles

  • Diagnosis is by NOTCH3 genetic testing; skin biopsy is now rarely needed

  • No disease-modifying therapy yet - management is meticulous vascular risk control and avoiding harmful exposures

  • Smoking cessation matters enormously; anticoagulants and thrombolysis carry particular considerations in CADASIL

Understanding it

About CADASIL, and what to do next.

CADASIL thickens and degrades the walls of the brain's small penetrating arteries. The clinical arc often begins deceptively as migraine with aura - sometimes with unusually prolonged or dramatic auras - years before small deep strokes start accumulating, each perhaps minor, collectively eroding processing speed, balance, mood and eventually independence. A family history of early strokes or dementia is common but not universal, since presentations vary widely even within one family.

MRI raises the flag: confluent white matter change out of proportion to age and risk factors, with anterior temporal pole involvement the classic pointer. Genetic testing settles it, and cascade counselling is offered to relatives on the usual carefully supported terms. Management is unglamorous and important: rigorous blood pressure control, statins where indicated, antiplatelet therapy as advised, and absolute smoking cessation - smoking measurably accelerates the disease. Migraine is treated along standard lines with some agent-specific caution. Specialist familial small vessel disease clinics offer coordinated care and access to the research pipeline, and referral there after diagnosis is worthwhile for most families.

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.

Frequently asked

Common questions about CADASIL.

Quick, plain-English answers to what people ask us most.

  • What is CADASIL?

    CADASIL is a recognised medical condition that can affect people in different ways, ranging from mild and easily managed to more significant, depending on the underlying cause, how early it is picked up, and how it is treated. Getting a clear diagnosis is usually the first step towards the right management plan.

  • What causes CADASIL?

    CADASIL can arise from a combination of factors, which may include genetics, lifestyle, environmental exposures, other underlying health conditions, or simply the normal effects of ageing on the body. In many cases no single cause is found, and several factors act together. A clinician can help identify which factors are most relevant in an individual case.

  • What are the symptoms of CADASIL?

    Symptoms of CADASIL vary from person to person and depend on how severe the condition is and which structures are affected. Some people notice symptoms gradually over weeks or months, while others experience a more sudden onset. Because symptoms can overlap with other conditions, a proper assessment is important to reach an accurate diagnosis rather than relying on symptoms alone.

  • Is CADASIL serious or dangerous?

    Most cases of CADASIL are manageable, especially when identified and treated early, but severity varies from mild and self-limiting to more significant, depending on individual circumstances. Left unassessed, some cases can lead to complications or a longer-term impact on daily life. If you are worried about your symptoms, it is always worth getting them checked rather than waiting.

  • Is CADASIL hereditary or genetic?

    Some cases of CADASIL have a genetic component and can run in families, while others occur without any family history at all. Having a relative with the condition may modestly increase your own risk, but it does not mean you will definitely develop it yourself. If you are concerned about a family history, mention this to your doctor, as it may occasionally influence screening or monitoring.

  • Can CADASIL be cured, reversed or prevented?

    Outlook varies with CADASIL: some cases resolve completely with treatment, others improve significantly but need ongoing management, and a smaller number become a long-term condition to be controlled rather than cured. Prevention strategies, such as addressing modifiable risk factors, can reduce your chances of developing it or of it recurring, but cannot guarantee against it in every case.

  • How is CADASIL treated?

    Treatment for CADASIL is tailored to the individual and depends on severity, underlying cause and personal circumstances. Options can range from simple lifestyle measures, monitoring and conservative treatment through to medication, specialist procedures or surgery in more significant cases. A specialist assessment helps identify which combination of treatments is most appropriate for you.

  • How long does CADASIL last?

    The duration of CADASIL varies considerably: some people recover within days or weeks, while others live with a more persistent or recurring condition that needs ongoing management. Response to treatment, how early it is started, and individual factors all influence the timescale. Your clinician can give you a more personalised estimate once your specific circumstances are known.

  • When is surgery needed for CADASIL?

    Surgery is not usually the first option for CADASIL and is generally reserved for cases where conservative treatment has not worked, symptoms are severe, or there is a significant structural problem that needs to be corrected directly. The decision depends on your specific findings, symptoms and how they are affecting your life. A specialist consultation is the best way to establish whether surgery is being considered too early, or should be considered sooner rather than later.

  • When should I see a doctor about CADASIL, and how quickly can I be seen privately?

    It is worth seeing a doctor about CADASIL if symptoms are persistent, getting worse, or affecting your daily life, rather than waiting to see if they settle on their own. NHS routine referrals to a specialist can currently take anywhere from around 20 to 45 weeks or more depending on your area, whereas a private consultant can typically see you within about 2 weeks. Getting an earlier assessment can help clarify the diagnosis and start the right treatment sooner.