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arnold-chiari deformity in Medicine

Arnold-Chiari deformity

(ärnəld-, -nōlt′-)
n.
  1. 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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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.