Monoamniotic twins

Monoamniotic twins (/ˌmɒnoʊˌæmniˈɒtɪk/), also known as Monoamniotic-Monochorionic twins or MoMo twins, are identical twins that share the same amniotic sac within their mother's uterus. Monoamniotic twins are always identical, always monochorionic and are usually monozygotic.

Etymology

The term "Monoamniotic" is derived from the Greek words "monos" meaning single, and "amnion" meaning a thin membrane enclosing the fetus. The term "Monochorionic" is derived from "monos" meaning single, and "chorion" meaning outer fetal membrane.

Definition

Monoamniotic twins are a subtype of identical twins that share the same amniotic sac. This condition occurs in about 1% of identical twin pregnancies. These twins are always monochorionic, meaning they share the same chorion, and are usually monozygotic, meaning they originate from a single fertilized egg.

Complications

Monoamniotic twins are at risk for a number of complications, including Twin-to-Twin Transfusion Syndrome (TTTS), cord entanglement, and cord compression. These complications can lead to significant morbidity and mortality.

Diagnosis

Diagnosis of monoamniotic twins is typically made via ultrasound during the first trimester of pregnancy. The absence of a separating membrane is a key indicator of monoamniotic twins.

Treatment

Treatment options for monoamniotic twins vary depending on the specific complications present. Frequent monitoring via ultrasound is typically recommended. In some cases, early delivery may be necessary to prevent complications.

Related Terms

External links

Medical encyclopedia article on Monoamniotic twins
Wikipedia's article - Monoamniotic twins

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Monoamniotic twins