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Anencephaly
How is it diagnosed?
Anencephaly can be detected prenatally by ultrasound sometimes as early as fourteen weeks depending on the lie of the fetus. It should be easily visible at twenty weeks on the ultrasound. Amniocentesis and measurement of the levels of alpha feta protein in the amniotic fluid can confirm the diagnosis. Alpha feta protein would be expected to be extremely high in this defect.
How is it caused?
| Inheritance patterns andprenatal diagnosis 
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