Fetus with MMC (IMAGE)
Caption
Part of the spinal cord and spinal nerves, usually encased in a sac, protrude through an opening in the back and is exposed to the amniotic fluid. The brainstem (hindbrain) descends, or herniates, into the spinal canal in the neck and blocks the flow of cerebrospinal fluid. This can cause a damaging buildup of fluid in the brain called hydrocephalus.
Credit
The Children's Hospital of Philadelphia
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