Habitual abortion:  a radiographic technique to demonstrate the incompetent internal os of the cervix.
D000026:Abortion, Habitual; D000028:Abortion, Induced; D000022:Abortion, Spontaneous; D002584:Cervix Uteri; D004194:Disease; D005260:Female; D006801:Humans; D011247:Pregnancy; D014591:Uterine Diseases
ABORTION; CERVIX, UTERINE/diseases