Answers are grounded in this paper and cite their sources.
The authors review the most common congenital anomalies of the central nervous system (CNS): neural tube defects (NTDs), ventriculomegaly/holoprosencephaly, hydranencephaly, holoprosencephaly sequence, iniencephaly, and microcephaly. They emphasize the importance of the diagnostic tools (biochemical markers of the maternal serum, ultrasound screening, invasive techniques), methods which are complementary to each other.
No takes yet. Share an insight, caveat, or question.
Csabay et al. (1998) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: