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hydranencephaly

(hī′drăn-ən-sĕfə-lē)
n.
  1. The congenital absence of the cerebral hemispheres in which the space in the cranium that they normally occupy is filled with fluid.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.