A malformed fetus in a rudimentary uterine horn pregnancy

We present a case of a 13-week pregnancy with a malformed fetus in a ruptured, non-communicating rudimentary horn. The patient, a 21-year-old woman with pelvic and right-sided abdominal pain, was admitted to the gynecology clinic of our institution. A ruptured rudimentary horn pregnancy was diagnosed by ultrasonography. The fetus in the gestation sac showed evisceration of the liver and intestines and an absent left femur. There was an amniotic band extending across the body of the fetus. The ruptured horn was excised by laparotomy. The factors associated with rudimentary horn pregnancy and related fetal abnormalities are discussed.