In the United States,<unk>  occurs in about 1 out of every 10,000 births. Rates may be higher among Africans with rates in Nigeria estimated at 3 per 10,000 in 1990 while rates in Ghana estimated at 8 per 10,000 in 1992. Rates in China are estimated at 5 per 10,000. Research has suggested that, overall, female babies are more likely to be affected by the disorder.
Anencephaly
Exencephaly
Hydranencephaly
Hemihydranencephaly
Megalencephaly
Schizencephaly
Microhydranencephaly
Lissencephaly