Uterine rupture of a non-communicating rudimentary horn pregnancy with resultant successful outcome of an extremely premature baby born at 24 weeks of gestation

Mullerian anomalies occur in about 0.5% of reproductive-aged women; many remain asymptomatic only being discovered during surgery or on imaging done for unrelated reasons. These result from the abnormal formation, fusion or resorption of the mullerian duct during development. A unicornuate uterus with a rudimentary horn is one of the rarer subtypes, with such anomalies making up about 5% of all mullerian anomalies. Pregnancy in a non-communicating uterine horn (NCUH) is extremely rare, with an incidence between 1: 100,000 and 1: 140,000. There is a high risk of uterine rupture if pregnancy occurs in a non-communicating uterine horn. We present here a case of a non-communicating rudimentary horn pregnancy, with a successful outcome.