Etiology
The uterus is formed during embryogenesis by the fusion of the two mullerian ducts. During this fusion a resorption process eliminates the partition between the two ducts to create a single cavity. This process begins caudally and advances cranially, thus a complete septum formation represents an earlier disturbance of this absorption than the incomplete form. Causes for incomplete absorption are not known.
Read more about this topic: Uterine Septum