Negative sonographic findings followed by rapid cervical dilatation due to cervical incompetence.
D002584:Cervix Uteri / Q000473:pathology*; D004108:Dilatation, Pathologic / Q000209:etiology; D005260:Female; D006801:Humans; D011247:Pregnancy; D014463:Ultrasonography; D002581:Uterine Cervical Incompetence / Q000150:complications*