Chiari Malformation

Diagnosis and decompression surgery for Chiari malformation in Lahore, Pakistan

What is a Chiari Malformation?

A Chiari malformation (also called Arnold-Chiari malformation) is a structural problem at the base of the skull, in which the cerebellar tonsils — the lowest part of the cerebellum — extend down through the foramen magnum (the natural opening at the base of the skull) into the upper part of the spinal canal.

This crowding can compress the brainstem and upper spinal cord, and can also block the normal flow of cerebrospinal fluid (CSF) between the brain and spinal cord. In some cases this leads to the formation of a syrinx — a fluid-filled cavity within the spinal cord itself (syringomyelia), which can cause additional neurological symptoms.

Dr. Waqas Mehdi, FCPS Neurosurgeon at MidCity Hospital Lahore, evaluates patients with Chiari malformation — many of whom are found incidentally on an MRI done for headaches or neck pain — and advises on whether observation or decompression surgery is the right course of action.

Symptoms of Chiari Malformation

!Headache at the back of the head, worse with coughing, sneezing, or straining

!Neck pain and stiffness

!Dizziness and balance problems

!Numbness or tingling in the hands and arms

!Muscle weakness

!Difficulty swallowing or a hoarse voice (in more significant cases)

!Sleep-related breathing problems

!Symptoms of syringomyelia — loss of pain/temperature sensation, if a syrinx is present

Diagnosis

MRI Brain and Cervical Spine: The definitive test — shows the degree of cerebellar tonsil descent through the foramen magnum, and reveals whether a syrinx is present in the spinal cord.

CINE MRI (CSF Flow Study): A specialised MRI sequence that assesses whether cerebrospinal fluid flow is obstructed at the level of the foramen magnum — important for surgical decision-making.

Clinical Neurological Examination: Assesses for signs of brainstem or spinal cord involvement, which helps correlate imaging findings with the patient's actual symptoms.

Treatment Options

Observation

For patients with a mild, incidentally discovered Chiari malformation and no significant symptoms, periodic clinical review and MRI monitoring is often all that is needed.

Posterior Fossa Decompression Surgery

The standard surgical treatment for symptomatic Chiari malformation. A small amount of bone is removed at the back of the skull (and sometimes the first vertebra) to relieve crowding, often combined with opening the dura (duraplasty) to restore normal CSF flow.

Management of Associated Syringomyelia

In most cases, successful decompression surgery allows the syrinx to shrink over time without needing separate treatment. Follow-up MRI tracks this response.

Symptomatic Treatment

Pain management and physiotherapy can help with headache and neck symptoms in patients being observed or recovering from surgery.

Frequently Asked Questions

What is a Chiari malformation?

Chiari malformation is a structural condition in which the lower part of the cerebellum (the brain's balance centre) extends down through the opening at the base of the skull into the spinal canal, where it can compress the brainstem and upper spinal cord and disrupt normal cerebrospinal fluid flow.

Who treats Chiari malformation in Lahore?

Dr. Waqas Mehdi, FCPS Neurosurgeon and Assistant Professor at KEMU/Mayo Hospital, Lahore, evaluates patients with Chiari malformation, including those found incidentally and those with symptoms, and performs decompression surgery when indicated.

What are the symptoms of Chiari malformation?

The classic symptom is a headache at the back of the head, often triggered or worsened by coughing, sneezing, or straining. Other symptoms include neck pain, dizziness, balance problems, numbness or tingling in the hands, and in some cases swallowing difficulty or sleep-related breathing issues.

Does Chiari malformation always need surgery?

No. Many people with a mild, incidentally discovered Chiari malformation (sometimes called Chiari I) have no symptoms and never need treatment. Surgery is generally reserved for patients with significant symptoms, an associated syrinx (fluid cavity) in the spinal cord, or clear evidence of brainstem/cord compression.

What does Chiari decompression surgery involve?

Posterior fossa decompression surgery removes a small amount of bone at the back of the skull (and sometimes the top of the first vertebra) to create more space for the cerebellum and restore normal cerebrospinal fluid flow, often combined with opening the covering membrane (duraplasty).

Found to Have a Chiari Malformation on MRI?

Consult Dr. Waqas Mehdi for a clear explanation of what your MRI shows and whether treatment is needed. MidCity Hospital, Lahore — Mon to Sat, 6–8 PM.

Call: 0300-8482624 Book Appointment

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