There's evidence that Chiari malformation runs in some families. This impaired circulation of cerebrospinal fluid can lead to the blockage of signals transmitted from the brain to the body, or to a buildup of spinal fluid in the brain or spinal cord.Īlternatively, the pressure from the cerebellum on the spinal cord or lower brainstem can cause neurological signs or symptoms. When the cerebellum is pushed into the upper spinal canal, it can interfere with the normal flow of cerebrospinal fluid that protects the brain and spinal cord. The lower part of the cerebellum (tonsils) is displaced into the upper spinal canal.Ĭhiari malformation type 2 is nearly always associated with a form of spina bifida called myelomeningocele. ![]() If you or your child has any of the signs and symptoms that may be associated with Chiari malformation, see your doctor for an evaluation.īecause many symptoms of Chiari malformation can also be associated with other disorders, a thorough medical evaluation is important.Ĭhiari malformation type 1 occurs when the section of the skull containing a part of the brain (cerebellum) is too small or is deformed, thus putting pressure on and crowding the brain. This type of Chiari malformation has a higher mortality rate and may also cause neurological problems. This form of Chiari malformation is diagnosed at birth or with an ultrasound during pregnancy. In the most severe type of the condition, Chiari malformation type 3, a portion of the lower back part of the brain (cerebellum) or the brainstem extends through an opening in the back of the skull. It may also be diagnosed after birth or in early infancy. In myelomeningocele, the backbone and the spinal canal don't close properly before birth.Ĭhiari malformation type 2 is usually noted with ultrasound during pregnancy. The signs and symptoms can include those related to a form of spina bifida called myelomeningocele that nearly always accompanies Chiari malformation type 2. In Chiari malformation type 2, a greater amount of tissue extends into the spinal canal compared with that in Chiari malformation type 1.
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