Rudimentary horn pregnancy with neonatal and maternal survival.

Pregnancy in a rudimentary uterine horn is an unusual event that often terminates early in gestation with catastrophic hemorrhage. Under rare circumstances an intact rudimentary horn or a secondary abdominal pregnancy from a ruptured horn continues to term.These cases present with pain or anemia, an uncertain or abnormal fetal lie, and may be complicated by symptoms of preeclampsia. Physical examination, and ultrasonic and radiographic studies lead to the correct diagnosis. Rapid surgical intervention can result in fetal and maternal survival with preservation of fertility.