title: False-negative screen for neural tube defect in spina bifida with stenosis of the aqueduct of Sylvius.
mesh_terms: D000015:Abnormalities, Multiple / Q000175:diagnosis*; D000328:Adult; D002535:Cerebral Aqueduct / Q000002:abnormalities*; D005188:False Negative Reactions; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000175:diagnosis*; D007231:Infant, Newborn; D008591:Meningomyelocele / Q000175:diagnosis*; D011247:Pregnancy; D011296:Prenatal Diagnosis; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: D000509:alpha-Fetoproteins