vanishing twin


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vanishing twin

[van′ishing]
a twin embryo or fetus that is aborted during pregnancy.
The spontaneous regression of a 2nd gestational product, which occurs in 20% of twin gestations
Diagnosis Ultrasound in 1st trimester

vanishing twin

The spontaneous regression of a 2nd gestational product, which occurs in 20% of twin gestations Diagnosis Ultrasound in 1st trimester. Cf Twins.

vanishing twin

Fetal resorption in multiple gestation.
See: gestation, multiple
See also: twin
References in periodicals archive ?
Her study included 1,432 singleton pregnancies, with or without vanishing twins.
Friedman said this was the first vanishing twin study to control for maternal variables that could influence outcome.
Compared with singletons who did not have a vanishing twin, singleton survivors of vanishing twin pregnancies had significantly lower birth weights and gestational ages, more days in intensive care, and higher neonatal mortality rates.
The phenomenon of vanishing male conceptuses may be compared with that of vanishing twins, due to twins disappearing before they are clinically recognized [twin conceptions are estimated to be 12% of all natural conceptions, of which only about 2% survive to term as twins and about 12% result in single births (36)].