I have just been reading an article in the latest Midwives magazine, and came across an article on this.

I have never even heard of it, but found it very interesting. It occurs in twin pregnancies. According to the article it is a 'medicalised term for sharing a placenta.
This happens because a single embryo divides, but if this happens eight or nine days after fertilisation, then they share the same placenta and chorion, and are both in the same amniotic sac.

Monochorionic monoamniotic twins happen in only about 1% of of all twin pregnancies.

If there is a membrane, then the pregnancy will be given the term monochorionic diamniotic.

It is fascinating, and I just wondered if anyone else had heard about it, or know anything about it?

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Midwifemissy x

Student Midwife 2007
Student uni rep
Educational Resources Manager

PAB Support Worker