无脑儿是神经管缺陷的一种类型，是单纯性先天性缺陷，与染色体异常无关。
Anencephaly is a form of neural tube defect that is typically an isolated birth defect that is not related to chromosomal abnormalities.
出生缺陷前五位的是唇腭裂、神经管发育畸形、无脑儿、先天性心脏病、脐疝；
The top five birth defects are cleft lip and palate, neural tube development defects, no brain child, congenital heart disease, umbilical hernia;
出生缺陷前五位的是唇腭裂、神经管发育畸形、无脑儿、先天性心脏病、脐疝；
The top five birth defects are cleft lip and palate, neural tube development defects, no brain child, congenital heart disease, umbilical hernia;
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