Abstract:

Monochorionic monoamnionic (MCMA) monozygotic twin is a very rare type of twin pregnancy, which is extremely high-risk twin pregnancy. Because the two fetuses share the same amniotic cavity and there is no fetal membrane separation between the two fetuses, there is a greater possibility of intrauterine accidents due to umbilical cord entanglement and knot. For pregnant women with twin pregnancies should be clear as soon as possible its chorionic properties. Once diagnosed as MCMA twins, vigilance should be raised and termination of pregnancy in the guidelines recommend gestational weeks to improve maternal and infant outcomes. This paper retrospectively reports two cases of monochorionic monoamnionic twins pregnancy with true umbilical knot and successful delivery in Shanxi Maternal and Child Health Hospital, to improve obstetricians′ awareness of early diagnosis and differentiation of twin chorionic properties. Special attention should be paid to the abnormality of umbilical cord morphology and structure when diagnosed as monochorionic monoamnionic twins, prenatal management of monochorionic monoamnionic twins pregnancies should be strengthened.

Key words: Monochorionic monoamnionic twins pregnancy, Pregnancy,twin, Pregnancy outcome, Cesarean section, Prenatal diagnosis, Umbilical cord knot