Membranous occlusion of the cervix in pregnancy.
D000022:Abortion, Spontaneous; D000328:Adult; D002584:Cervix Uteri / Q000473:pathology; D005260:Female; D006801:Humans; D007751:Labor, Induced; D008566:Membranes / Q000473:pathology; D011247:Pregnancy; D011248:Pregnancy Complications / Q000473:pathology