The Medical Bulletin of Haseki Training and Research Hospital, published by Galenos Publishing. Haseki T›p Bulteni, Galenos Yay›nevi taraf›ndan bas›lm›flt›r. AddressforCorrespondence/Yaz›flmaAdresi:Derya Akdag Cirik Etlik Zubeyde Hanim Women’s Health Training and Research Hospital, Clinic of Obstetrics and Gynecology, Ankara, Turkey Phone: +90 312 567 40 00/4330 E-mail: deryaakdag@yahoo.com Received/GeliflTarihi:01 February 2016 Accepted/KabulTarihi:07 February 2016 Pregnancy in a woman with unicornuate uterus with non-communicating uterine horn is a considerably rare condition with an incidence of one in 100.000 cases. Fertilization occurs by transperitoneal migration of sperm and, uterine rupture is a considerably frequent complication of those pregnancies. Therefore, early diagnosis is of great importance due to the potential risk of maternal mortality. Herein, we present two cases of rudimentary horn pregnancy diagnosed by ultrasonography in the first trimester, and treated with laparoscopic approach. These two patients attended the hospital in the sixth and twelfth gestational weeks respectively, and the first case was misdiagnosed with tubal ectopic pregnancy in the emergency unit. After detailed transvaginal ultrasonographic examination, a gestational sac separate from the uterus and surrounded by myometrium was seen and the final diagnosis was the rudimentary horn pregnancy. The diagnosis was also confirmed after laparoscopy in both cases, and the patients underwent excision of the rudimentary horn.