During the embryologic development of the female the two mullerian ducts fuse from below upward to form the vaginal tract and the uterus. The numerous anomalies of the female genital system that have been reported in the literature can be ascribed in the great majority of cases to lack of fusion at any location throughout the extent of the two canals and in the remainder to the rudimentary development of one duct.
In various animals the mullerian ducts normally do not fuse and consequently two tubular uteri are present. In the human being, in the event of incomplete development of one duct, the rudimentary side appears as an appendage to an apparently normal uterus. Since Mauriceau and Vassal reported the first case in 1669, over 100 cases of varying degree and extent have been described in the literature.
Usually menstruation occurs from the two uteri simultaneously; however, it may come
Braze MA. BICORNATE UTERUS WITH PREGNANCY IN EACH HORN. JAMA. 1943;123(8):474–476. doi:10.1001/jama.1943.82840430001007
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