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Double uterus is a rather rare condition, but unless the possibility of such an abnormality is borne in mind, there is a chance that its occurrence will lead to mistake or difficulty in diagnosis, when with a normal organ there would be no difficulty. From recent literature, I have been able to find less than 150 reported cases. There are no doubt many more that have never been reported, and I can readily see how numerous others could exist without ever having been discovered.
The condition is due to a lack of proper fusion, or to a lack of absorption of the fused walls of the ducts of Mueller, which normally unite to form vagina, uterus and tubes, at about the seventh or eighth week of uterine life. All degrees of malformation may occur, from a simple bicornate uterus to a complete double uterus, with two uterine canals, two cervices
Catlin JJ. DOUBLE UTERUS. JAMA. 1924;82(25):2030. doi:10.1001/jama.1924.26520510004009c