title: Diagnosis of an incompetent internal cervical os.
mesh_terms: D000026:Abortion, Habitual / Q000517:prevention & control; D000033:Abortion, Threatened / Q000517:prevention & control; D000293:Adolescent; D000328:Adult; D004106:Dilatation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007231:Infant, Newborn; D008722:Methods; D011247:Pregnancy; D013997:Time Factors; D002581:Uterine Cervical Incompetence / Q000175:diagnosis* / Q000601:surgery