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A member asked:
Pregnant with twins and they are in the same sac but they have seperate amneons. are they identical twins?
A doctor has provided 1 answer
Most likely, yes: Monochorionic twins are almost always monozygotic (identical) twins that share the same placenta. Monochorionic twins occur in 0.3% of all pregnancies. 75% of monozygotic twin pregnancies are monochorionic; the remaining 25% are dichorionic diamniotic. Monochorionic-diamniotic (mono-di) twins are almost always monozygotic (identical) with a few exceptions where the blastocysts have fused.
Answered 12/9/2013
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