Unicornuate uterus

True unicornuate uterus is a rare anomaly which is often associated with renal tract anomalies, and may predispose to infertility and pregnancy complications. Three additional cases are reported here. One of the women had associated bony and cardiac anomalies, although there was no good evidence that these were part of a syndrome. The diagnosis in each case was made incidentally during the surgical investigation of abdominal pain, which in one case was caused by an ectopic pregnancy, itself a rare occurrence with unicornuate uterus.