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Because anencephaly is caused by abnormalities of the neural tube, it is classified as a neural tube defect. Because the neural tube fails to close properly, the developing brain and spinal cord are exposed to the amniotic fluid that surrounds the fetus in the womb.
Every pregnant woman is at risk for a possible birth defect. In fact, 95% of neural tube defects (NTDs) occur in women with no personal or family history of NTDs.However, according to the Centers for Disease Control and Prevention (CDC), here are some risk factors that are known to increase the risk of a NTD:n fact, 95% of neural tube defects (NTDs) occur in women with no personal or family history of NTDs. However, according to the Centers for Disease Control and Prevention (CDC), here are some risk factors that are known to increase the risk of a NTD: