Objective       To investigate the clinical characteristics and perinatal outcomes of unicornuate uterus pregnancy.

    Methods       The clinical data of patients with unicornuate uterus pregnancy who delivered between January 2007 and December 2016 in the Peking Union Medical College Hospital were retrospectively reviewed, and the general characteristics, diagnostic methods, complications during gestational and delivery period, mode of delivery and perinatal outcomes were analyzed.

    Results       Twenty-three patients with unicornuate uterus pregnancy (24 successful pregnancies) were included in this study. The age of the patients at delivery was (30.96±3.61) years, 4 cases(17.4%) were diagnosed with ultrasound before pregnancy, 3 cases (13.0%) were diagnosed by ultrasound during the first trimester, 6 cases(26.1%) were diagnosed by hysterosalpingography, 7 cases (30.4%) were diagnosed based on previous surgical exploration, and 3 cases (13%) were diagnosed during the present deliveries. Adverse outcomes were observed in 9 cases(60%) among 15 previous deliveries, including mainly spontaneous abortion or embryo arrest. Adverse outcomes during the present pregnancies included nuchal cord (45.84%), breech position (29.17%), and fetal growth restriction (16.67%). Gestational age at birth was (37.55±2.38) weeks, cesarean section rate was 95.8%, intrapartum bleeding volume was (177±49)mL, neonatal survival rate was 100%, and neonatal body weight was (2826.0±692.8)g.

    Conclusions       The incidence rate of fetal complications in unicornuate uterus pregnancy is higher than that in the general population, but most of them can achieve good pregnancy outcomes.