title: Entangled umbilical cords: a sign of monoamniotic twins.
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D014427:Twins; D014430:Twins, Monozygotic; D014463:Ultrasonography; D014470:Umbilical Cord