Chiari malformations (CMs) are structural defects in the cerebellum, the part of the brain that controls balance. When the indented bony space at the lower rear of the skull is smaller than normal, the cerebellum and brain stem can be pushed downward. The resulting pressure on the cerebellum can block the flow of cerebrospinal fluid (the liquid that surrounds and protects the brain and spinal cord) and can cause a range of symptoms including dizziness, muscle weakness, numbness, vision problems, headache, and problems with balance and coordination. Symptoms may change for some individuals depending on buildup of CNS and any resulting pressure on tissue and nerves. CMs are classified by the severity of the disorder and the parts of the brain that protrude into the spinal canal. The most common is Type I, which may not cause symptoms and is often found by accident during an examination for another condition. Type II (also called Arnold-Chiari malformation) is usually accompanied by a myelomeningocele-a form of spina bifida that occurs when the spinal canal and backbone do not close before birth, causing the spinal cord to protrude through an opening in the back. This can cause partial or complete paralysis below the spinal opening. Type III is the most serious form of CM, and causes severe neurological defects. Other conditions sometimes associated with CM include hydrocephalus, syringomyelia (a fluid-filled cyst in the spinal cord), and spinal curvature.
Medications may ease certain symptoms, such as pain. Surgery is the only treatment available to correct functional disturbances or halt the progression of damage to the central nervous system. More than one surgery may be needed to treat the condition. Some CMs have no noticeable symptoms and do not interfere with the person's activities of daily living.
Many people with Type I CM are asymptomatic and do not know they have the condition. Many individuals with the more severe types of CM and have surgery see a reduction in their symptoms and/or prolonged periods of relative stability, although paralysis is generally permanent.
The NINDS supports research on disorders of the brain and nervous system such as Chiari malformations. The goals of this research are to increase scientific understanding of these disorders and to find ways to prevent, treat, and, ultimately, cure them. Current NINDS-funded research includes studies to better understand the genetic factors responsible for the malformation, and factors that influence the development, progression, and relief of symptoms among people with syringomyelia, including those with Chiari I malformations.
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March of Dimes
Works to improve the health of babies by preventing birth defects and infant mortality through programs of research, community services, education, and advocacy.
1275 Mamaroneck Avenue
White Plains, NY 10605
Tel: White Plains
National Organization for Rare Disorders (NORD)
Federation of voluntary health organizations dedicated to helping people with rare "orphan" diseases and assisting the organizations that serve them. Committed to the identification, treatment, and cure of rare disorders through programs of education, advocacy, research, and service.
55 Kenosia Avenue
Danbury, CT 06810
Spina Bifida Association
Non-profit association that provides information and referrals through a clearinghouse and toll-free number. Promotes research into the causes, treatment and prevention of Spina Bifida; conducts public awareness campaigns; and encourages socialization and training for people with Spina Bifida.
4590 MacArthur Blvd. NW
Washington, DC 20007-4266
American Syringomyelia & Chiari Alliance Project (ASAP)
Non-profit organization that works to improve the lives of people with syringomyelia, Chiari malformations, and related disorders. Publishes a newsletter and offers other written information, videotapes, an annual conference, and other services.
P.O. Box 1586
Longview, TX 75606-1586