List the four central nervous system malformations that cause
polyhydramnios.

Explanation:

The Central nerve system malformations which causes polyhydramnios are as follows -

1 . The baby born with an underdeveloped and malformed brain and skull , Anencephaly .

2. The Malformation in the development of the spinal cord , Spina bifida .,

3. The abnormal size of the cranium and the head .

4. The accumulation of the excessive fluid in the brain cavities , Hydrocephalus .

answer:

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explanation:

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