[Preliminary investigation on the ultrasonic diagnosis of the umbilical cord twined about the neck of the fetus (analysis of 18 cases)].
D005260:Female; D005313:Fetal Death / Q000517:prevention & control; D005316:Fetal Distress / Q000517:prevention & control; D005333:Fetus; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014463:Ultrasonography; D014470:Umbilical Cord