This video shows Vanishing twin syndrome showing one normally developing baby alongside a blighted ovum.
Vanishing twin syndrome
Vanishing twin syndrome or disappearing twin syndrome is a term used to describe the spontaneous loss, or miscarriage, of one developing baby early in multiple pregnancies. Or one normally developing baby is present alongside a blighted ovum. A blighted ovum will cause a miscarriage usually at 7-12 weeks of pregnancy. The pregnant woman realizes that pregnancy is not developing properly and starts to shed blood and tissue from the uterus.
The intertwin membrane
The intertwin membrane refers to a membraneous separation between two fetuses in a twin pregnancy. Depending on the chorionicity and amnionicity, the membrane may have a number of layers
1). Di-chorionic di-amniotic (DCDA) pregnancy
composed of two chorionic and two amniotic layers
usually has a thick (often taken as more than 2 mm ) inter-twin membrane
more reflective
may demonstrate the twin-peak sign at its margin
2). Mono-chorionic di-amniotic (MDCA) pregnancy
composed of two amniotic layers only
usually has a thin (often taken as less than 2 mm inter-twin membrane
less reflective
may demonstrate the T sign at its margin
3). Mono-chorionic monoamniotic (MCMA) pregnancy
no intertwin membrane
