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Transvaginal ultrasound showing a cross-section of a bicornuate uterus

Transvaginal ultrasound showing a cross-section of a bicornuate uterus, with two cavities or "horns" visible at the left and right, respectively. In the "horn" to the right, a gestational sac is visible, with a diameter of 5.7 mm, corresponding to a gestational age of between 4 and 5 weeks. This projection did 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 an intrauterine device (IUD) with copper, presumably because the IUD was located in the other "horn." (Courtesy of Mikael Häggström on July 14, 2014. Public domain.)

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