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Health condition · Clinically reviewed

CSF leak, postural headache and the modern repair options.

Spinal or cranial, spontaneous or after a procedure. A CSF leak deserves the right imaging, the right team and, when needed, a targeted repair.

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A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against specialist neurosurgery, neurology and rhinology sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including epidural blood patch, transvenous embolisation and endoscopic endonasal repair.

Key facts

CSF leak at a glance.

The essentials, in plain English. What a CSF leak is, how it presents and how it is treated in the UK.

  • What it is

    Leakage of cerebrospinal fluid from the subarachnoid space through a defect in the dura, either along the spine or at the skull base.

  • Two broad types

    Spinal CSF leak (the commonest cause of spontaneous intracranial hypotension) and cranial CSF leak (usually presenting as CSF rhinorrhoea or otorrhoea).

  • Hallmark of SIH

    A postural headache that is worse upright and better lying flat, often with neck pain, nausea, tinnitus and cognitive fog.

  • Definitive cranial test

    Beta-2 transferrin on nasal or ear fluid is specific to CSF and confirms a cranial leak.

  • First-line procedure

    Epidural blood patch is the first procedural step for most spinal leaks, often high-volume and repeated.

  • Specialist care

    Complex leaks and CSF-venous fistulas need a specialist MDT with neurology, neuroradiology, neurosurgery and rhinology.

Why this guide matters

An under-recognised condition, with real treatments.

CSF leaks are often missed, mislabelled as migraine or told to rest and hope. The three points below shape everything else on this page.

  • Posture is the biggest clue

    A headache that behaves differently upright and lying flat is one of the strongest pointers to spontaneous intracranial hypotension.

  • Imaging and testing are specific

    MRI features of SIH, extradural CSF collections on spine MRI and beta-2 transferrin from nasal fluid give you a proper answer.

  • Modern repair changes lives

    Directed blood patch, transvenous embolisation and endoscopic skull-base repair have transformed outcomes for the right leak.

How the diagnosis is made

From first headache to a clear plan.

The steps a UK neurology, neuroradiology or skull-base team will normally follow, in order, so you know what to expect and why.

  1. 01

    Assessing

    History and posture

    A careful history for postural headache, timing, triggers and any preceding procedure, trauma or connective tissue features.

  2. 02

    Assessing

    Clear nasal or ear discharge

    For suspected cranial leak, note whether fluid is clear, watery, worse leaning forward or unilateral.

  3. 03

    Assessing

    MRI brain with contrast

    For suspected SIH, looks for pachymeningeal enhancement, brain sagging, tonsillar descent, subdural collections and venous distension.

  4. 04

    Confirming

    MRI whole spine

    Screens for extradural CSF collections and meningeal diverticula that point to the level of the leak.

  5. 05

    Confirming

    Beta-2 transferrin

    The definitive test on nasal or ear fluid to confirm a cranial CSF leak; beta-trace protein is a useful alternative.

  6. 06

    Planning

    CT or digital subtraction myelography

    Dynamic imaging in a specialist centre to localise the leak and, in the case of DSM, to find a CSF-venous fistula.

  7. 07

    Planning

    Specialist MDT review

    Complex cases go to a neurology, neuroradiology, neurosurgery and rhinology MDT to plan definitive treatment.

Typical timeline: first imaging within weeks, specialist plan in a few months.

Symptoms

What a CSF leak actually feels like.

Spinal leaks and cranial leaks look very different in the clinic. Here is the range, from classic postural headache to clear fluid from the nose or ear.

  • Postural headache

    Worse when upright and better lying flat within minutes; the hallmark symptom of spontaneous intracranial hypotension.

  • Neck pain and stiffness

    Often with photophobia, nausea and vomiting; can mimic meningitis without the fever.

  • Tinnitus and hearing changes

    Muffled hearing, ear fullness or pulsatile tinnitus from altered inner-ear pressures.

  • Visual and cognitive symptoms

    Blurred vision, double vision, brain fog and slowed thinking in longer-standing leaks.

  • Behavioural or FTD-like change

    Rare, in chronic severe SIH with marked brain sagging; can mimic a frontotemporal dementia picture and is reversible with treatment.

  • CSF rhinorrhoea

    Clear watery nasal discharge, often unilateral and worse leaning forward; think cranial leak.

  • CSF otorrhoea

    Clear fluid from the ear, usually with a history of middle-ear surgery, trauma or a skull-base defect.

  • Red flag - meningitis or coma

    Fever, meningism, seizure, pneumocephalus or reduced consciousness needs emergency assessment.

Treatment

How CSF leaks are treated in the UK.

Conservative care first for many, epidural blood patch for most spinal leaks, and specialist embolisation or endoscopic repair when the leak is identified and localised.

  • Conservative measures

    Bed rest, hydration, caffeine and simple analgesia can help acute post-procedural leaks, but are often not enough for spontaneous SIH.

  • Epidural blood patch

    First-line procedural step for spinal leaks - autologous blood injected into the epidural space, often high-volume, directed and repeated.

  • Epidural fibrin glue

    A selective option when blood patch has not held, or when a specific dural defect or diverticulum is targeted.

  • Transvenous embolisation

    Endovascular closure of a CSF-venous fistula, pioneered at Duke and now emerging in a very small number of specialist UK centres.

  • Spinal microsurgical repair

    Definitive surgical closure of an identified spinal dural defect when blood patch and embolisation have not worked.

  • Endoscopic endonasal repair

    First-line surgical treatment for anterior skull-base CSF rhinorrhoea, with high success and reduced morbidity compared to open surgery.

  • Nasoseptal flap reconstruction

    Transplanted fascia, fat and a vascularised nasoseptal (Hadad-Bassagasteguy) flap rebuild the skull-base defect.

  • Open craniotomy

    Reserved for large defects, tumour-related leaks or failed endoscopic repair; a specialist neurosurgical option.

What this guide is based on

The sources behind every claim on this page.

Specialist consensus and UK society guidance, current at the time of last review.

Key references

Guidelines and consensus we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your neurologist, neurosurgeon or rhinologist knows your history and imaging and can tell you which parts apply to you. If in doubt, get seen.

  • Schievink WI. Spontaneous spinal cerebrospinal fluid leaks and intracranial hypotension. JAMA, current guidance.

  • International Consortium on SIH. Consensus recommendations on diagnosis and management of spontaneous intracranial hypotension.

  • ENT UK and British Rhinological Society. Guidance on management of CSF rhinorrhoea and skull-base defects.

  • CSF Leak Association UK. Patient guidance and support resources.

Red flags

When a CSF leak needs urgent attention.

Many leaks can be managed on a planned pathway. These are the situations that cannot wait, and where a specialist opinion is needed the same day.

  • Meningitis

    Fever, neck stiffness, photophobia and unwell appearance in a patient with a known or suspected cranial CSF leak - needs urgent hospital assessment.

  • Pneumocephalus

    Air inside the skull on imaging, often with sudden headache change or reduced consciousness - a neurosurgical emergency.

  • Reduced consciousness or coma

    Rare in severe SIH with marked brain sagging - requires immediate neurosurgical and neurology input.

  • Seizure

    New seizure in the context of a CSF leak needs urgent imaging and specialist review.

  • Rapid cognitive or behavioural decline

    FTD-like change, apathy or personality change in longstanding SIH - flag for specialist MDT.

  • Persistent postural headache after procedure

    Severe headache lasting more than a few days after lumbar puncture, epidural or spinal surgery deserves review for a persistent dural leak.

  • Clear nasal or ear discharge with meningitis history

    Recurrent meningitis with a clear watery leak should trigger urgent skull-base imaging and beta-2 transferrin testing.

  • Visual loss or diplopia

    New visual disturbance in a CSF leak needs same-day neuro-ophthalmology or emergency assessment.

  • Rapidly enlarging subdural collections

    On imaging, in a patient with SIH - needs urgent neurosurgical discussion before considering drainage.

Living with it

A recoverable condition, with the right team.

Four things that make the biggest difference day to day. Working with gravity, pacing your upright time, building the right team and using peer support.

A quiet reminder

Recovery is rarely linear.

Symptoms often improve in steps, with the odd relapse. Track what helps and share it with your team so treatment can be tuned to you.

  1. 01 Posture

    Work with gravity, not against it

    Flat rest in the early days of a leak or after a blood patch reduces symptoms and gives the dura the best chance to heal.

  2. 02 Pacing

    Ration your upright time

    Gradual, guided return to upright activity is safer than pushing through; symptoms are a useful signal, not weakness.

  3. 03 Team

    Build the right team

    Neurology, neuroradiology, neurosurgery, rhinology, pain and, when relevant, rheumatology all have a role - a specialist SIH clinic can co-ordinate them.

  4. 04 Support

    You are not alone

    The CSF Leak Association UK offers peer support, patient information and links to specialist centres across the UK.

Frequently asked

Everything we get asked about CSF leak.

Quick answers on postural headache, diagnosis, blood patch, CSF-venous fistula and where to be treated in the UK.

  • What is a CSF leak?

    A CSF (cerebrospinal fluid) leak is the escape of the fluid that cushions the brain and spinal cord through a defect in the dura. It can happen along the spine, causing spontaneous intracranial hypotension, or at the skull base, causing clear fluid to leak from the nose or ear.

  • What does a postural headache feel like?

    It comes on or worsens within minutes of standing or sitting up and eases when you lie flat. Many people describe pressure at the back of the head and neck, with nausea, ringing in the ears or muffled hearing, and difficulty concentrating.

  • How is a CSF leak diagnosed?

    For spinal leaks, MRI of the brain with contrast and of the whole spine is the usual first step, followed if needed by CT or digital subtraction myelography in a specialist centre. For cranial leaks, beta-2 transferrin testing on nasal or ear fluid is the definitive confirmatory test, often alongside high-resolution CT of the skull base.

  • What is an epidural blood patch?

    A procedure in which a small volume of your own blood is injected into the epidural space to seal the leak. For spontaneous spinal leaks, patches are often high-volume, directed by imaging and may need to be repeated. It remains the first-line procedural treatment before surgery is considered.

  • What is a CSF-venous fistula?

    An abnormal connection between the spinal subarachnoid space and a nearby vein that lets CSF drain into the venous system. It is a recognised cause of SIH, needs digital subtraction myelography to find and can be treated by transvenous embolisation in a small number of specialist centres.

  • Where can I get treated for a CSF leak in the UK?

    Assessment and treatment usually happen at specialist neuroscience centres such as Queen Square, King’s College Hospital, Cambridge, Bristol, Oxford, Manchester and Nottingham. Endoscopic endonasal repair for cranial leaks is delivered by specialist rhinology and skull-base surgery teams. The CSF Leak Association UK can help you find the right pathway.

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