Syringomyelia
A Chiari malformation, previously called an Arnold-Chiari malformation, is where the lower part of the brain pushes down into the spinal canal.
Many people with a Chiari I malformation will not have any symptoms. Sometimes they're only found after an (MRI) scan of the brain is carried out for another reason. If you develop syringomyelia, you may also experience problems using your hands, difficulty walking, pain, and problems with bladder or bowel control.
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 headaches and neck pain. The main operation for Chiari malformation is called decompression surgery.
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.