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Chiari Malformation

What is a Chiari malformation?

A Chiari malformation is a congenital (present at birth) defect in the area of the back of the head where the brain and spinal cord connect. The condition is also called Arnold Chiari malformation. There are four types of Chiari malformations, including the following:

What causes Chiari malformation?

Although the exact cause of Chiari malformation is unknown, it is thought that a problem during fetal development may cause the abnormal brain formation. Chiari malformation may be caused by exposure to harmful substances during fetal development or associated with genetic problems or syndromes that may have a tendency to run in families.

Theories suggest that the following may predispose the fetus to problems that affect the normal development of the head during pregnancy:

What are the symptoms of a Chiari malformation?

The following are the most common symptoms of a Chiari malformation. However, each child may experience symptoms differently. In infants and older children born with this condition, symptoms may include:

The symptoms of Chiari malformation may resemble other conditions or medical problems. Always consult your child's physician for a diagnosis.

How is a Chiari malformation diagnosed?

If a Chiari malformation occurs with other congenital (present at birth) defects, the diagnosis may be made at birth. Other times, the diagnosis is made after the onset of specific signs and symptoms, and after diagnostic testing. The physician obtains a complete prenatal and birth history of the child and may also ask if there is a family history of any medical problems. The physician will also ask about developmental milestones, such as the age the child sat up, crawled, or walked since a Chiari malformation can be associated with other neuromuscular disorders. Developmental delays may require further medical follow up for underlying problems.

During the examination, a measurement of the circumference of the child's head is taken and compared to a scale that can identify normal and abnormal ranges.

Diagnostic tests that may be performed to confirm the diagnosis of a Chiari malformation include:

Treatment for a Chiari malformation:

Specific treatment for a Chiari malformation will be determined by your child's physician based on:

Medical management consists of frequent physical examinations and diagnostic testing to monitor the growth and development of the brain, spinal cord, skull, and backbones.

Some types of Chiari malformations may require surgery to relieve increased pressure inside the head or neck area, or to help drain excess cerebral spinal fluid from the brain. Very severe Chiari malformations may be life threatening.

Parents are instructed to watch for any changes that may affect the child's neurological status, including the following:

Life-long considerations for a child with a Chiari malformation:

The full extent of the problems associated with a Chiari malformation are usually not completely understood immediately at birth, but may be revealed as the child grows and develops. Children born with a Chiari malformation require frequent examinations and diagnostic testing by his/her physician to monitor the development of the head as the child grows. The medical team works hard with the child's family to provide education and guidance to improve the health and well-being of the child.

Genetic counseling may be recommended by the physician to provide information on the recurrences for Chiari malformation and any available testing.

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Online Resources of Neurological Disorders


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