Monochorionic twin pregnancy

Last revised by Owen Kang on 8 May 2020

A monochorionic twin pregnancy is a type of monozygotic twin pregnancy where the twins share a single chorion. Depending on the sharing of the amnion this can be divided into two types.

As they are almost always monozygotic (except in extremely unusual cases), both the twins in a monochorionic twin pregnancy are of the same gender.

Pathological processes that occur almost exclusively in monochorionic pregnancies include:

See also

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