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A 45-year-old member asked:

What causes arnold chiari malformation?

1 doctor answer1 doctor weighed in
Dr. William Goldie
Pediatric Neurology 48 years experience
No one knows: Chiari described malformations of the cerebellum. Arnold added the defects in the brain associated with spina bifida. This became known as chiari type 2 or arnold chiari. There is kinking of the medulla and fourth ventricle, obstruction of the outlet of the fourth ventricle, peaking of brainstem, fusion of thalamus, as well as hydrocephalus and incomplete closure of spinal cord.

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A 43-year-old member asked:

What are possible causes of arnold-chiari malformation?

2 doctor answers5 doctors weighed in
Dr. Edison McDaniels
Specializes in Neurosurgery
Acquired or congenit: There are both acquired and congenital forms of Chiari. In a 43 yo, it is likely acquired. The acquired form, almost always a Chiari I, may be caused by increased pressure in the head, or more likely the cause will be unknown. Chiari II is always a congenital condition and is much more severe than Chiari I (in general). Read more here: http://surgeonwriter.com/chiarimonograph/
A 44-year-old member asked:

What are the symptoms of arnold-chiari malformation?

2 doctor answers3 doctors weighed in
Dr. Kevin Teal
Neurosurgery 30 years experience
Headaches/dizziness: Most common symptom is headache. Other symptoms can include dizziness, unsteady gait, double vision, and passing out episodes. The headaches can be worse if there is straining.
A 45-year-old member asked:

What are the tests for arnold-chiari malformation?

1 doctor answer2 doctors weighed in
Dr. Kevin Teal
Neurosurgery 30 years experience
Head/ Cervical MRI: Chiari malformation is best diagnosed with a head MRI without contrast to assess for the abnormal tonsil position and determine whether hydrocephalus, or water on the brain, is present also. A cervical MRI without contrast can assess for a problem called a syrinx, or a fluid cavity in the center of the spinal cord. A lumbar MRI without contrast can also exclude a tethered cord causing numb legs.
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A 35-year-old member asked:

What is the difference between arnold chiari malformation and chiari malformation?

3 doctor answers9 doctors weighed in
Dr. Nalinaksha Joshi
Neurology 23 years experience
Same: No difference, in short form people call as chiari malformation.
A 38-year-old member asked:

What's the arnold chiari malformation?

3 doctor answers4 doctors weighed in
Dr. Carl Decker
Radiology 24 years experience
Small back of skull.: Chiari malformations develop due to a decreased size in the back of the skull. Because there is not enough space for the brain to develop, a part of the brain called the cerebellar tonsils get pushed through through the hole where the spinal cord attaches to the brain. This results in increased pressure and development of "cysts" in the spinal cord. Chiari ii has additional brain&cord changes.

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Last updated Mar 22, 2021

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