Unruptured postdated pregnancy with a live fetus in a noncommunicating rudimentary horn

Pregnancy in a noncommunicating rudimentary horn is an extremely rare and a life-threatening condition as it mostly terminates by rupture by the second trimester of pregnancy. Postdated pregnancy and delivery of a live fetus in a rudimentary horn have been rarely reported. A case of noncommunicating unruptured rudimentary horn pregnancy progressing to 41 weeks and 3 days period of gestation where the diagnosis was initially missed at obstetric sonogram at 18 and 34 weeks and then misdiagnosed later as abdominal pregnancy is being reported. Preoperative diagnosis, successful delivery of a live fetus and excision of the rudimentary horn was performed.