Aug 2, 2022 · A monochorionic diamniotic (MCDA) twin pregnancy is a subtype of monozygotic twin pregnancy. These fetuses share a single chorionic sac but have two amniotic sacs and two yolk sacs. It accounts for the vast majority (70-75%) of monozygotic twin pregnancies although only ~30% of all twin pregnancies.

Monochorionic, diamniotic (MCDA) twins are the product of a single fertilized ovum (egg), resulting in genetically identical offspring. MCDA twins share a single placenta (blood supply) but have separate amniotic sacs.

Monochorionic twins are monozygotic (identical) twins that share the same placenta. If the placenta is shared by more than two twins (see multiple birth), these are monochorionic multiples. Monochorionic twins occur in 0.3% of all pregnancies. [1] .

Nov 18, 2015 · In monochorionic twin pregnancy, middle cerebral artery (MCA) peak systolic velocity (PSV) should be recorded from 20 weeks, in order to screen for TAPS. In MCDA twins, the amniotic fluid volume (deepest vertical pocket) should be assessed and documented at each ultrasound scan to screen for TTTS.

In this review, we summarise the latest evidence relating to ultrasound surveillance of twin pregnancies including first trimester assessment and screening, growth surveillance and the detection and management of the complications of monochorionic pregnancies including twin-to-twin-transfusion syndrome, selective fetal growth restriction, twin r...

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Surveillance includes measurement of fetal growth, amniotic fluid volume, umbilical artery Doppler and middle cerebral artery Doppler in addition to detailed anatomy scans, cervical length measurement, and fetal echocardiogram.

May 24, 2024 · monochorionic diamniotic (MCDA) pregnancy: two amnions (much more common ~90%) As they are almost always monozygotic (except in extremely unusual cases), both the twins in a monochorionic twin pregnancy are of the same sex.

Although most monochorionic diamniotic (MCDA) twin pregnancies result in healthy births, vascular anastomoses complicate their intrauterine journey. Because of these connections, 10% develop twin-twin transfusion syndrome (TTTS), and another 5% develop twin anemia polycythemia sequence (TAPS). 1 By definition, MCDA twins are monozygotic and ...

Jul 7, 2019 · Monochorionic diamniotic pregnancies are characterized by the presence of two fetuses of the same gender, a single placenta, a thin two-layered intertwin membrane, and a characteristic T-shaped insertion of the intertwin membrane at the placental surface.