Uterus didelphys with an imperforate hemivagina is an embryonic malformation of the genitourinary system of the female that occurs between the 12th and 16th weeks of pregnancy. This defect may manifest itself as a duplication of all or part of the female reproductive system. The obstruction of one hemivagina will block outflow, resulting in complications such as haematocolpos and haematometra. The persistence of this situation may also be complicated by the occurrence of endometriosis as a result of blood reflux into the abdominal cavity. These anomalies are frequently accompanied by kidney and urinary tract malformations (i.e. kidney agenesis and dysplasia, double collecting system, ectopic ureter) on the same side as the defect.
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