arnold-chiari deformity

Medical Dictionary

Arnold-Chiari deformity Ar·nold-Chiari deformity (är'nəld-, -nōlt'-)
n.
A congenital deformity at the base of the brain, often associated with spina bifida, in which the cerebellar tissue is elongated and extends into the fourth ventricle.

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WordNet
arnold-chiari deformity

noun
deformity in which part of the brain protrudes through the skull 
WordNet® 3.0, © 2006 by Princeton University.
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