Chiari Malformation

A Chiari malformation means the lowest part of the cerebellum, the tonsils, sits below the opening at the base of the skull and crowds the space around the top of the spinal cord. Type 1 is the form usually found in teenagers and adults. The older name Arnold-Chiari strictly refers to type 2, which is seen with spina bifida.

Many people have a low-lying cerebellum on MRI and no symptoms at all, and they need no treatment. Surgery helps when typical symptoms or a fluid cavity in the spinal cord (a syrinx) are present, but it does not cure every headache.

Symptoms

• Headache at the back of the head brought on by coughing, sneezing, laughing or straining
• Neck pain
• Dizziness and unsteadiness
• Numbness, tingling or loss of temperature sense in the hands
• Difficulty swallowing, hoarseness or choking
• Sleep apnoea, particularly in children
• Scoliosis in a child, which may be the only sign of a syrinx

Causes and risk factors

Type 1 is thought to arise because the bony compartment at the back of the skull is a little small for the cerebellum, so tissue is pushed downwards as it grows. It is usually present from birth and sometimes runs in families. A similar appearance can be acquired, from low spinal fluid pressure after a leak or lumbar shunt, or from raised pressure in the head, and these must be recognised because decompression would be the wrong operation. Connective tissue disorders are associated in a minority.

How it is diagnosed

• MRI of the brain: Shows how far the tonsils descend, typically more than 5 millimetres, and how crowded the area is.
• MRI of the whole spine: Looks for a syrinx and for a tethered cord.
• CSF flow (cine) MRI: Shows whether fluid movement at the skull base is blocked.
• Sleep study and swallowing assessment: Used when symptoms suggest brainstem involvement, especially in children.

Treatment options

• Observation: No symptoms and no syrinx means periodic review only.
• Symptom management: Headache treatment and physiotherapy for mild cases.
• Posterior fossa decompression: A small piece of bone at the skull base, and usually the back of the first vertebra, is removed to create room. The covering membrane may be opened and patched to widen the space further.
• Treatment of associated problems: Hydrocephalus is treated first if present. A syrinx usually shrinks after a good decompression and rarely needs its own drain.

When it is urgent

Rapidly worsening weakness, new difficulty swallowing or breathing, repeated vomiting with severe headache, or loss of bladder control need emergency assessment close to home. In a baby or child, pauses in breathing or feeding difficulty need urgent local paediatric review.

Travelling to Türkiye for treatment

Decompression is a planned operation, so travel for it is feasible: about three to five nights in hospital and roughly two weeks in the city before flying. The most useful first step is often a remote review of your MRI, because a considerable share of people referred for surgery do not need it. For children, the decision should involve a paediatric neurosurgeon, and follow-up MRI at home should be agreed in advance.

Send your reports, scans and a short history and a Clinic-Y coordinator replies within 24 hours with suitable teams and written, all-inclusive proposals side by side. Reviewing your case is free.

Frequently Asked Questions