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Violation of the structure of the uterus.
1. Congenital anomalies of the uterus - saddle, bicornuate uterus, intrauterine septum.
2. Uterine fibroids - the most unfavorable is the presence of a submucosal node.
3. Operations on the cervix.
4. Intrauterine synechia - adhesions after curettage, complicated by an inflammatory process in the uterine cavity.