Rates of other types of<unk>  vary significantly by country from 0.1 to 5 per 1000 births. On average in developed countries it occurs in about 0.4 per 1000 births. In the United States it affected about 0.7 per 1000 births, and in India about 1.9 per 1000 births. Part of this difference is believed to be due to race, with Caucasians at higher risk, and part due to environmental factors. It is most common in the Celtic people (12.5 per 10,000 live births), and it is rare in Asians and people of African descent. In the United States, rates are higher on the East Coast than on the West Coast, and higher in white people (one case per 1000 live births) than in black people (0.1–0.4 case per 1000 live births). Immigrants from Ireland have a higher incidence of<unk>  than do natives. Highest rates of the defect in the USA can be found in Hispanic youth. The highest incidence rates worldwide were found in Ireland and Wales, where three to four cases of myelomeningocele per 1000 population have been reported during the 1970s, along with more than six cases of anencephaly (both live births and stillbirths) per 1000 population. The reported overall incidence of myelomeningocele in the British Isles was 2.0–3.5 cases per 1000 births. Since then, the rate has fallen dramatically with 0.15 per 1000 live births reported in 1998, though this decline is partially accounted for because some fetuses are aborted when tests show signs of<unk>  (see Pregnancy screening above).
Spina bifida
Teratoma
Hydranencephaly
Anencephaly
Lissencephaly
Exencephaly
Schizencephaly
Cranioschisis