Transvaginal ultrasound showing a cross-section of a bicornuate uterus, with two cavities or "horns" visible at left and right, respectively. In the "horn" to the right, a gestational sac is visible, with a diameter of 5.7mm, corresponding to a gestational age of between 4 and 5 weeks. This projection did not not transect the maximal diameter, thus giving a bit smaller diameter in the image. The patient sought medical care because of a positive pregnancy test despite having a intrauterine device (IUD) with copper, presumably because the IUD was located in the other "horn".