Congenital Uterine Anomaly and Pelvic Organ Prolapse: A Rare Case of Pelvic Organ Prolapse in a Complete Bicornuate Uterus with Successful Pregnancy Outcomes Undiagnosed until the Time of Sacrocolpopexy.

Müllerian development anomalies (MDAs) are most commonly diagnosed in the reproductive period. A bicornuate uterus is the result of a fusion defect of the Müllerian ducts, causing an abnormal fundal outline. Most of the cases are diagnosed early in life and present with obstetrical complications, such as recurrent pregnancy loss, preterm birth, intrauterine growth restriction, placental abruption, and cervical incompetence. Pelvic organ prolapse (POP) in women with MDAs has been reported; however, all reported cases were when MDAs are diagnosed before or simultaneously with the development of POP in premenopausal young women aged < 35. A 52-year-old menopausal woman, who successfully delivered vaginally at term, was presented with protruding mass through vaginal introitus. On POP-Q examination, the cervix was elongated and descended to 1 cm out of the hymen during bearing down; however, the uterine bodies were confined in the pelvic cavity, which is commonly encountered among POP patients with large uterus due to uterine fibroids or adenomyosis. She also diagnosed for complete bicornuate uterus and underwent robotic sacrocolpopexy for advanced stage POP. It is presumed to have been caused by the bicornuate uterus that prevented the total uterine prolapse with the effect of extending both uterine horns bilaterally inside the pelvic cavity and trapping the uterus within the pelvis. Herein, we report a rare case of complete bicornuate uterus with multiple successful vaginal deliveries at term without obstetric complications, which remained undiagnosed until she was managed for the POP in her postmenopausal period.