n.無(wú)腦畸形

Anencephaly is absence of the fetal cranial vault. 無(wú)腦兒是胎兒顱穹窿缺陷。

The absence of the fetal cranial vault in anencephaly is shown here. 無(wú)腦兒顯示胎兒顱穹窿缺陷。

The rate of anencephaly is now less than 1 in 10,000 live births in some places. 目前在一些地方新生無(wú)腦兒發(fā)病率低于1/10000。

The highest of neural tube defects is spina bifida,then is anencephaly encephalocele,and so on. 發(fā)生率最高的神經(jīng)管畸形是脊柱裂,其他依次為無(wú)腦畸形、腦膨出、小頭畸形。

Although the rate of anencephaly decreased 36% from 1991 to 1995, it did not change significantly from 1995 to 2005. 無(wú)腦癥比率從1991至1995年減少36%25，1995至2005年間則無(wú)顯著改變。