Arnold Chiari versus Dandy Walker - USMLE Forums
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  #1  
Old 07-30-2009
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Anatomy Arnold Chiari versus Dandy Walker

It's almost certain that if you have one of these in the options then the other will also be there!

Here's a quick reminder

Arnold Chiari:
a congenital anomaly in which a narrow craniospinal junction and a small posterior cranial fossa causes displacement of the cerebellum and medulla oblongata downward which leads to compression of the CSF passage at the level of foramen magnum. Two types, type I is asymptomatic and type II is symptomatic and commonly associated with meningomyelocele and syringomyelia.

Dandy Walker:
also congenital and also around the fourth ventricle but this time it's a small cerebellar vermis that give room to the fourth ventricle to expand in a cyst like structure which could also obstruct leading to hydrocephalus. Unlike Arnold, the posterior fossa is large.
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  #2  
Old 01-03-2013
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i.e. in Dandy Walker, there's a lot of space in the post fossa for the 4th ventricle to WALK around in an expand cystically.
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  #3  
Old 06-18-2016
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Another easier way to remember:
Chiari: herniation of cerebellum
Walker: cystic dilation of cerebellum
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  #4  
Old 07-09-2016
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Kudosss?????
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Anatomy-, Nervous-System-, Pathology-, Syndromes-Acronyms

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