Abstract
Robert's uterus is a rare Müllerian malformation first characterized by a French gynecologist Héléne Robert in 1969. It represents an asymmetric division of the uterine cavity. A 45-year-old female patient presented with vaginal bleeding and vague abdominal pain for the course of 20 days, with a blood human chorionic gonadotropin level of 10331.00 mIU/mL, and a gestational sac in the right uterine horn without a fetal heart beat revealed by the ultrasound. Ectopic pregnancy in the right uterine horn seemed to be the most likely diagnosis. Laparoscopic and hysteroscopic attempts to terminate the pregnancy failed. A pelvic magnetic resonance imaging (MRI) performed after the surgery demonstrated Robert's uterus with pregnancy in the blind hemicavity. When a pregnancy sac has been revealed by an ultrasound but nothing has been found by a hysteroscopy, a possibility of uterine malformation should be considered. Radiologists and gynecologists should consider the application of MRI for diagnosis of congenital Müllerian uterine anomalies.