Congenital malformations of the nervous system (Q00-Q07)
Q04: Other congenital malformations of brain

cyclopia (Q87.0)
macrocephaly (Q75.3)
Q04.0: Congenital malformations of corpus callosum
Q04.1: Arhinencephaly
Q04.2: Holoprosencephaly
Q04.3: Other reduction deformities of brain
Q04.4: Septo-optic dysplasia of brain
Q04.5: Megalencephaly
Q04.6: Congenital cerebral cysts
Q04.8: Other specified congenital malformations of brain
Q04.9: Congenital malformation of brain, unspecified

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