Chiari Malformation Summary Chiari malformations (CMs) are structural defects in the cerebellum. The cerebellum is the part of the brain that controls balance. With CM, brain tissue extends into the spinal canal. It can happen when part of the skull is too small, which pushes the brain tissue down. There are several types of CM. One type often happens in children who have neural tube defects. Some types cause no symptoms and don’t need treatment. If you have symptoms, they may include Neck pain Balance problems Numbness or other abnormal feelings in the arms or legs Dizziness Vision problems Difficulty swallowing Poor hand coordination Doctors diagnose CM using imaging tests. Medicines may ease some symptoms, such as pain. Surgery is the only treatment available to correct or stop the progression of nerve damage. NIH: National Institute of Neurological Disorders and Stroke National Institute of Neurological Disorders and Stroke Resources Chiari Malformation National Institute of Neurological Disorders and Stroke Chiari Malformation Nemours Foundation Chiari Malformation American Syringomyelia & Chiari Alliance Project Chiari Malformation Mayo Foundation for Medical Education and Research Chiari Malformation National Institute of Neurological Disorders and Stroke Chiari Malformation: Diagnosis C&S Patient Education Foundation Chiari Malformation: Symptoms C&S Patient Education Foundation Chiari Malformation: Treatment C&S Patient Education Foundation Finding a Neurosurgeon C&S Patient Education Foundation Taking Chiari to School: A Guide for Parents C&S Patient Education Foundation Clinical Trials ClinicalTrials.gov: Arnold-Chiari Malformation National Institutes of Health Journal Articles Chiari Malformation