Twin pregnancy associated with incompetence of the internal os.
D002584:Cervix Uteri / Q000601:surgery*; D005260:Female; D006801:Humans; D008499:Medical Records; D011247:Pregnancy; D011272:Pregnancy, Multiple; D059285:Pregnancy, Twin; D014599:Uterus
CERVIX UTERI/surgery; PREGNANCY, MULTIPLE/case reports