(A) 1st. degree (incomplete) inversion: the fundus is within the endometrial cavity. (B) 2nd. degree (complete) inversion: the fundus protrudes through the cervical os. (C) 3rd. degree inversion (uterine prolapse): the fundus protrudes to or beyond the introitus. (D) 4th. degree (total uterine and vaginal) inversion: both the uterus and vagina are inverted.
