Uterine didelphys is a rare type of deformity in the female reproductive organs, affecting 1 out of 1000 women. When it occurs, some organs may be either split or duplicated. Typically, some of these "extra" organs are non-functional or semi-functional appendages, although on occasion they will be completely function in all normal respects, and often independently.
It occurs when, in utero, the mullerian ducts do not form right. The ducts forme two complete and separate uteri. Each uterus also has its own cervix. There is have a septum down the middle of the vagina, which is sometimes called a double vagina. There is one ovary to each uterus. It is possible to get pregnant in both uteri at the same time.
A mullerian duct fusion problem can cause 2 main entities of duplication, such as two uteri, two cervices, and two vaginas. A bicornuate uterus has two uterine cavities, one or two cervices, and usually one vagina.
A UK woman with two wombs gave birth to triplets in 2006. Hannah Kersey, of Northam in Devon, gave birth to a pair of identical twins from an egg that implanted into one womb and then divided, and to an infant from a single egg that implanted into the other womb. This was the first known birth of its kind.. It is estimated that the possibility of such a birth is about 1 in 25 million.
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