monoamniotic twins

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mon·o·am·ni·ot·ic twins

twins within a common amnion; such twin's are monozygotic in origin and may be conjoined.
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That study, published in 2013, reviewed 114 monoamniotic twin pregnancies (228 fetuses).
There several health risks for monoamniotic twins due to the closeness within the amniotic sac.
Emma Canning's daughters, Hannah and Sophie, were monoamniotic twins who shared the same birth sac and placenta.
The chance of having monoamniotic twins is 70,000 to one but because they are so close together in the womb the odds on them actually surviving doubles to 140,000 to one.
Last night Emma said: "It's been hard when you know so many monoamniotic twins don't make it.
In this respect, we cannot exclude the possibility that at least a part of the S100B present in monoamniotic twins is a consequence of compression of the fetuses in the sac.
Iatrogenic monoamniotic twins as a complication of therapeutic amniocentesis.