ICD-11 definition : A condition caused by failure of the neural tube to close completely during the antenatal
period. This condition is characterized by complete absence of the skull, extensive
defects in the vertebrae and skin, and absence of the brain.;
A condition caused by failure of the neural tube to close completely during the antenatal
period. This condition is characterized by complete absence of the skull, extensive
defects in the vertebrae and skin, and absence of the brain.