Skip to main content

Neurosurgery · UK

Syringo-subarachnoid shunt - draining a syrinx, done properly.

A silicone catheter that drains a fluid-filled cavity in the spinal cord into the surrounding CSF space. A consultant neurosurgeon, the full cause conversation up front, and MDT review - because a syrinx is a symptom, not a diagnosis.

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

Indicative pricing

What a private syringo-subarachnoid shunt costs in the UK.

Indicative ranges across our partner neurosurgical units.

In short

£25,000–£38,000, home 3–5 nights.

Procedure Indicative range
Neurosurgical consultation £300–£500
Whole-spine MRI + cine CSF-flow study £900–£1,600
Syringo-subarachnoid shunt (single level) £25,000–£38,000
Syringo-subarachnoid shunt (complex, revision) £35,000–£45,000
Combined foramen magnum decompression + shunt £38,000–£55,000
Syringo-pleural or syringo-peritoneal shunt £28,000–£42,000
Post-operative neurorehabilitation (per week) £3,500–£6,500

Prices vary by hospital, by the consultant neurosurgeon, and by whether the operation is a single-level shunt, a revision, or combined with a foramen magnum decompression. Rehabilitation adds to the total.

The problem

The right cause, the right operation, and long-term surveillance.

Syringomyelia is where general spine practice quietly under-delivers - the wrong operation offered, decompression skipped, and shunt follow-up dropped. We fix all three before you consent.

  • What is causing the syrinx?

    Chiari, tethered cord, arachnoiditis, post-traumatic or idiopathic - the cause changes the operation. Cine CSF-flow MRI is done first, not last.

  • Decompression or shunt?

    For Chiari-related syrinx the answer is almost always decompression first. A shunt is chosen only when the block cannot be relieved another way.

  • Plan the follow-up before the operation

    Shunt malfunction is common. MRI at 3 and 12 months and annual review are booked before you leave hospital, not after symptoms return.

When it helps

When a syringo-subarachnoid shunt is the right step.

The clinical pictures we see most, plus the red flag that means neurosurgery urgently rather than a routine appointment.

  • Symptomatic syringomyelia

    A fluid-filled cavity in the spinal cord causing progressive weakness, sensory loss or pain - where imaging shows an expanding syrinx.

  • Post-traumatic syrinx

    A syrinx that appears months or years after a spinal cord injury and now drives worsening neurology above the original level.

  • Arachnoiditis-related syrinx

    Scarring of the arachnoid after infection, bleed or previous surgery blocking CSF flow and forming a cavity.

  • Chiari without foramen magnum block

    Chiari-related syrinx where the CSF block sits below the foramen magnum, so decompression alone will not drain it.

  • Persistent syrinx after decompression

    A cavity that has not collapsed 6–12 months after foramen magnum decompression or tethered-cord release, with worsening symptoms.

  • Idiopathic syringomyelia

    A cavity with no clear cause on imaging, progressive symptoms and CSF-flow evidence of blockage at the syrinx level.

  • Failed prior shunt

    A previous syringo-subarachnoid, syringo-pleural or syringo-peritoneal shunt that has blocked, displaced or fractured.

  • Red flag: rapid neurological decline

    New paraplegia, brainstem signs, respiratory compromise or bulbar symptoms need same-day neurosurgery - not a routine referral.

Procedure options

Approach and shunt type both depend on the cause.

What each option involves - decompression, tethered-cord release, subarachnoid shunt, pleural or peritoneal drainage, or a combined operation.

  • Syringo-subarachnoid shunt

    The workhorse for isolated syrinx with a healthy subarachnoid space above it. A small silicone catheter drains the cavity into surrounding CSF.

  • Syringo-pleural shunt

    For patients with adhesions or scarring in the subarachnoid space - the catheter drains into the pleural cavity, where CSF is reabsorbed.

  • Syringo-peritoneal shunt

    A third option where pleural drainage is unsuitable - the catheter passes to the abdomen. Longer catheter, higher revision rate.

  • Foramen magnum decompression first

    For Chiari-related syrinx the standard first operation is decompression, not a shunt. The syrinx usually collapses without a catheter.

  • Tethered-cord release first

    Where a tethered cord drives the syrinx, releasing the filum or cord tether is done first and the syrinx often resolves.

  • Combined decompression + shunt

    For complex Chiari with a persistent large syrinx, decompression and shunt at one sitting - reserved for selected cases.

  • Endoscopic-assisted approach

    Small laminectomy with intraoperative ultrasound and, in some units, endoscopic assistance to place the catheter precisely.

  • Revision shunt

    For blocked or displaced shunts - full imaging, cause identified, catheter repositioned or converted to a different shunt type.

Safety and recovery

What to expect afterwards - honestly.

A syrinx shunt is well-established but not risk-free. The things worth planning are the cause, the operation type, and long-term MRI surveillance.

  • GA in a neurosurgical theatre

    Every shunt is under general anaesthetic with a neuro-anaesthetist. Small laminectomy, microsurgical arachnoid opening, catheter placement. Two to three hours.

  • CSF leak and pseudomeningocele

    CSF leaking from the wound or collecting under the skin - around 3–8 percent. Most settle with rest and a lumbar drain; a few need re-suturing.

  • Infection - meningitis and wound

    Deep infection under 2 percent, wound infection under 3 percent. Antibiotic prophylaxis is standard. Call the same day for fever, neck stiffness or spreading redness.

  • Neurological worsening

    Temporary sensory change or weakness in around 5 percent, permanent worsening in 1–2 percent. Intraoperative neuromonitoring is used routinely to reduce risk.

  • Shunt malfunction is the big long-term issue

    Blockage, displacement or fracture affects 30–50 percent of shunts within 10 years. Annual MRI review is essential - a silent block undoes the surgery.

  • Bleeding, DVT and PE

    Bleeding into the surgical bed under 1 percent. DVT prophylaxis is standard. Call for calf pain or breathlessness in the first six weeks.

  • Recovery timeline

    Back to office work in 4–6 weeks. Full activity by 3 months. Heavy lifting and contact sport reviewed at 3–6 months depending on operation.

  • Success rates

    Around 70–80 percent of shunts collapse the syrinx and stabilise or improve symptoms. Existing damage to the spinal cord does not always reverse.

  • Red flags after surgery

    Fever with neck stiffness, worsening weakness, loss of bladder or bowel control, severe headache or breathing difficulty need the same-day team or A&E.

Reading your operation note

Your operation note in four parts. Read the last one first.

Whichever shunt was used - subarachnoid, pleural or peritoneal - the note the neurosurgeon sends you keeps to the same shape.

A UK consultant neurosurgeon reviewing spinal MRI imaging

A quiet reminder

Neurosurgical language is precise and can read coldly - we translate it for you.

If you would like us to talk you through the operation note and the follow-up MRI before your review, just ask.

  1. 01 Header

    Indication, level and shunt type

    Why the operation was done, which spinal level was opened, and whether a subarachnoid, pleural or peritoneal shunt was placed.

  2. 02 Technique

    Findings and catheter position

    What was seen inside - arachnoid scarring, syrinx wall, CSF flow - and where each end of the catheter sits.

  3. 03 Findings

    Neuromonitoring and CSF collapse

    Intraoperative monitoring changes and whether the syrinx collapsed on ultrasound at the end of the operation.

  4. 04 Impression

    Follow-up MRI and long-term plan

    Read this first: MRI at 3 and 12 months, annual review thereafter, and what red flags mean a same-day call.

Recognised by major UK insurers

BupaAXA HealthVitalityAvivaWPACignaHealixBupaAXA HealthVitalityAvivaWPACignaHealixBupaAXA HealthVitalityAvivaWPACignaHealix

Syringo-subarachnoid shunt is usually covered when clinically indicated by a consultant neurosurgeon. Rehabilitation is often covered under a separate package.

Frequently asked

Everything we get asked about syrinx shunts.

Quick answers on alternatives, success rates, risks, cost and recovery.

  • What is a syringo-subarachnoid shunt?

    A small silicone catheter placed through a spinal laminectomy that drains fluid from a cavity in the spinal cord (the syrinx) into the surrounding cerebrospinal fluid space. It is used when the syrinx will not collapse with decompression or tethered-cord release alone.

  • When is a shunt preferred over foramen magnum decompression?

    For Chiari-related syrinx, decompression is almost always first - the syrinx usually collapses without a catheter. A shunt is preferred when the block is below the foramen magnum, when the syrinx is post-traumatic or arachnoiditis-related, when decompression has already failed, or when the cavity is idiopathic with clear CSF-flow blockage at the syrinx level.

  • How successful is the operation?

    Around 70–80 percent of shunts collapse the syrinx and stabilise or improve symptoms. Existing spinal cord damage does not always reverse - the aim is usually to stop progression rather than restore lost function. Long-term shunt survival is limited; 30–50 percent block or displace within 10 years and need revision.

  • How long is recovery?

    Hospital stay is usually 3–5 nights. Back to office work in 4–6 weeks and full activity by around 3 months. Heavy lifting and contact sport are reviewed at 3–6 months. Neurorehabilitation and physiotherapy are arranged where needed.

  • What are the main risks?

    CSF leak or pseudomeningocele in 3–8 percent, infection under 3 percent, temporary neurological worsening in around 5 percent and permanent worsening in 1–2 percent. The biggest long-term issue is shunt malfunction - blockage, displacement or fracture - which is why annual MRI review is essential.

  • How much does a private syringo-subarachnoid shunt cost in the UK?

    Roughly £25,000–£38,000 for a single-level shunt, £35,000–£45,000 for complex or revision cases, and £38,000–£55,000 when combined with a foramen magnum decompression.

Related treatments

Looking for something else?