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A 33-year-old woman presented with an ectopic pregnancy without any complaints. Laparoscopy was performed since a tubal pregnancy was expected. However, both fallopian tubes appeared normal and it was not possible to differentiate accurately between a pregnancy in a non-communicating horn and a pregnancy in a bicornuate uterus. We therefore performed MRI which showed a thin myometrium around the pregnancy. In order to differentiate between a communicating and a non-communicating uterine horn the authors performed a hysteroscopy. Since there was only one cervical os, and an entrance to the second uterine cavity was not seen along the cervical canal, it was concluded that this pregnancy was situated in a non-communicating rudimentary horn. The non-communicating uterine horn, with the pregnancy in situ, was completely removed. Since a pregnancy in a bicornuate uterus is viable in contrast to a pregnancy in a non-communicating horn, accurate diagnosis is important. [ABSTRACT FROM AUTHOR]