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Anatomy
A 1-day-old infant was born with the vault of the skull undeveloped, leaving the malformed brain exposed. A diagnosis of exencephaly is made. What is the embryologic cause of this condition?
Toxoplasmosis infection
Failure of closure of the cephalic part of the neural tube
Ossification defect in the bones of the skull
Caudal displacement of cerebellar structures
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