TY - CHAP M1 - Book, Section TI - Myelomeningocele A1 - Waberski, Andrew T. A1 - Reddy, Srijaya K. A2 - Freeman, Brian S. A2 - Berger, Jeffrey S. PY - 2016 T2 - Anesthesiology Core Review: Part Two Advanced Exam AB - Myelomeningocele is a neural tube defect that disrupts proper neuralization and closure of the spinal column. This defect occurs at 4–6 weeks gestation and results in evagination of the dural sac with neuronal tissue. Myelomeningoceles are the most common neural tube defect, with 3.4 out of every 10 000 live births being affected. Although the etiology of myelomeningocele is not completely understood, low levels of folic acid during pregnancy are thought to play a role. Prenatal screening, early termination, and folic acid supplementation have decreased the incidence of myelomeningoceles. Advances in fetal screening tests including maternal alpha-fetoprotein levels, amniocentesis, and fetal ultrasound have helped identify cases of myelomeningocele allowing for earlier interventions. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/19 UR - accessanesthesiology.mhmedical.com/content.aspx?aid=1135742544 ER -