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Neural tube defects are congenital malformations that occur when the neural tube fails to close properly during early embryonic development, typically between days 17-30 of gestation. The most common types include spina bifida, anencephaly, and encephalocele, with severity ranging from minor spinal defects to life-threatening brain malformations.
During normal embryogenesis, the neural plate folds to form the neural tube, which gives rise to the brain and spinal cord. Failure of neural tube closure results in exposed neural tissue and associated defects in surrounding bone, muscle, and skin structures. Genetic factors, maternal folate deficiency, certain medications, and environmental factors contribute to disrupted cellular proliferation and differentiation during neurulation.
Early prenatal screening with maternal serum alpha-fetoprotein levels and ultrasound imaging allows for detection and severity assessment of neural tube defects. Management requires multidisciplinary care including neurosurgery, orthopedics, and physical therapy, with treatment focusing on preventing complications such as infection, hydrocephalus, and neurological deterioration. Prevention strategies emphasize periconceptional folic acid supplementation, which can reduce occurrence by up to 70%.