Uterine septum is the most frequent (35-48%) structural uterine anomaly and associated with the poorest reproductive outcome. A 24 year old, nulliparous woman (G:1 P:0) applied to our clinic for routine first trimester pregnancy ultrasound. During the examination, it was recognized that most of the placenta was implanted on the uterine septum. There was no vascularity on uterine septum in doppler ultrasound. This is extremely rare case in literature showing placental implantation on uterine septum in the first trimester and reached term with successful pregnancy outcome. In conclusion, in contrast what is believed, pregnancy with placental implantation on complete uterine septum may progress successful.