Arnold Chiari malformations

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FA new errata now says that chiari II is associated with BOTH cerebellar tonsillar herniation and syringomyelia/myelomeningocele but almost every other source I read says Chiari I is a cerebellar tonsillar herniation and Chiari II is associated with syringomyelia/myelomenigocele and a vermis herniation.

Anyone know what is ACTUALLY correct?

 

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bump....anyone?

 

[mastamark]

FA new errata now says that chiari II is associated with BOTH cerebellar tonsillar herniation and syringomyelia/myelomeningocele but almost every other source I read says Chiari I is a cerebellar tonsillar herniation and Chiari II is associated with syringomyelia/myelomenigocele and a vermis herniation.

Anyone know what is ACTUALLY correct?

Chiari I is caused by cerebellar tonsil herniation down into the spinal canal. Milder and presents when older.

Chiari II can be due to cerebellar(any of the tissue including tonsil) and midbrain tissue into canal. The vermis is missing in this one I think. Shows up at birth, severe. Syringomyelia/myelomeningocele.

Edit: Dandy-Walker is bad too, it is due to a big 4th ventricle. Part/all of vermis missing. It can also be a birth. The back of the head will swell and there can be spina bifida.

 

[Step1Hash]

Chiari I is caused by cerebellar tonsil herniation down into the spinal canal. Milder and presents when older.

Chiari II can be due to cerebellar(any of the tissue including tonsil) and midbrain tissue into canal. The vermis is missing in this one I think. Shows up at birth, severe. Syringomyelia/myelomeningocele.

Edit: Dandy-Walker is bad too, it is due to a big 4th ventricle. Part/all of vermis missing. It can also be a birth. The back of the head will swell and there can be spina bifida.

Thanks! now i'm more confident in knowing that.