neural tube defects

Neural tube defects are congenital malformations arising from failed closure of the neural tube during early embryonic development, typically between days 18-28 of gestation, resulting in a spectrum of conditions ranging from the lethal anencephaly to the more survivable forms of spina bifida. These defects represent one of the most preventable categories of birth defects, as adequate periconceptional folic acid supplementation can reduce incidence by up to 70%, making recognition of risk factors and prevention strategies essential knowledge for any physician counseling women of childbearing age. Medical students must understand both the embryological basis and the clinical presentations because early prenatal diagnosis through maternal serum AFP screening and ultrasound findings like the lemon and banana signs enables critical decisions about pregnancy management, potential in-utero repair, and preparation for the multidisciplinary postnatal care these patients require.