hydranencephaly

noun
hy·​dran·​en·​ceph·​a·​ly | \ˌhī-ˌdran-en-ˈsef-ə-lē \
plural hydranencephalies

Medical Definition of hydranencephaly 

: a congenital defect of the brain in which fluid-filled cavities take the place of the cerebral hemispheres

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