Causes

Causes of Chiari I malformations

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 thought to be the result of part of the skull not being large enough for the brain.

Chiari I malformations can also develop in people with a tethered spinal cord, a build-up of fluid on the brain (hydrocephalus) , and some types of brain tumour.

Chiari malformations can sometimes run in families. It's possible that some children born with it may have inherited a faulty gene that caused problems with their skull development.

But the risk of passing a Chiari malformation on to your child is very small. And remember: even if your children do inherit it ,they may not experience symptoms.

Content supplied by the NHS Website

Medically Reviewed by a doctor on 12 Jul 2016