To predict the outcome of pregnancy, an understanding is required of the development of early extraembryonic structures, as well as pathological conditions. For example, the incidence of subchorionic hemorrhage in a normal early pregnancy is 2-4%. It increases the probability or abortion to twice the original incidence. In cases of imminent abortion, it is detected in every second pregnancy. If
... [Show full abstract] the hemorrhage does not cause an abortion, an increased risk for placental complications can be expected. The risk for pre-eclampsia, intrauterine growth restriction and Cesarian section due to intrauterine asphyxia increases significantly All these complications can probably be traced back to the same problem with placentation.
