Multiple pregnancy

Currently, it has been identified the incidence of multiple pregnancies is increasing. This is due to the extensive use of oral contraception, after the abolition of which there is a spontaneous maturation of two or more follicles, as well as the introduction of additional reproductive technologies associated with the induction of superovulation. Monochorial pregnancy, among the entire number of multiple pregnancies, is the most prognostically unfavorable. Perinatal complications and mortality in such a pregnancy is 10%, which exceeds the level of complications with dichorial twins by 3-4 times. The reasons for this situation lie in the structural features of the common placenta: often the existence of placental vascular anastomoses can lead to hemodynamic imbalance between twins. Syndrome of reverse arterial perfusion in twins is one of the most striking manifestations of abnormal vascular anastomosis in the monochorion placenta and is manifested by fetal malformations (the so-called malformations - “acardial monster”, “anencephalic acardia”).The article discusses the problem of complications associated with multiple pregnancy, as well as describes the case of prenatal diagnosis of reverse arterial perfusion syndrome with monochoricmonoamniotic twins.