immunohistochemical studies on decidual basalis and chorionic villi found that the imbalance of the immunological environment could be associated with recurrent pregnancy loss. anatomical defects and trauma fifteen per cent of women who have experienced three or more recurring miscarriages have some anatomical defect that prevents the pregnancy from being carried for the entire term. the structure of the uterus affects the ability to carry a child to term. anatomical differences are common and can be congenital. type of uterinestructure miscarriage rateassociated with defect