A Chiari malformation, previously called an Arnold-Chiari malformation, is where the lower part of the brain pushes down into the spinal canal.
There are four main types, but type 1, called Chiari I, is the most common.
In someone with Chiari I, the lowest part of the back of the brain extends into the spinal canal. This can put pressure on the brainstem, spinal cord, and obstruct the flow of fluid.
This page focuses on Chiari I malformations.
Find out what a Chiari malformation is, what problems it may cause, why it happens and how it can be treated.
The severity of Chiari malformations can vary from person to person, but generally: Chiari I malformations aren't considered life-threatening some people experience painful headaches, movement proble
Many people with a Chiari I malformation will not have any symptoms. Sometimes they'reonly foundafter an (MRI) scanof the brainis carried out for another reason.If symptoms do develop, theycan include
Treatment for Chiari I malformation depends on whether you have any symptoms and how severe they are. You might not need any treatment if you don't have any symptoms.Painkillers can help relieve any h
The exact cause of Chiari I malformations is unknown. It tends to be present from birth, but is normally only found in adulthood when symptoms develop or when an MRI scan is done. Many cases are thoug