What is vanishing twin?

Common occurence. It seems that most of us started as multiples that spontaneously reduced to singleton pregnancies. Vanishing twin is the one that was lost in the first trimester.

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What is vanishing twin syndrome?

Demise of one fetus. Vanishing twin syndrome is the demise of one twin sometime during the pregnancy. One study suggested it occurred about 20-30% of twin pregnancies. Most commonly it occurs early in the pregnancy and generally the remaining fetus has a good outcome. Its' occurrence later in pregnancy can be associated with adverse maternal and fetal outcomes. Read more...
Dissapearance of one. Vanishing twin syndrome is the identification of a multifetal gestation with subsequent disappearance of one or more fetuses. In vanishing twin syndrome, there may be complete reabsorption of a fetus, formation of a fetus papyraceus (ie, a "mummified" or compressed fetus), or development of a subtle abnormality on the placenta such as a cyst, subchorionic fibrin, or amorphous material. Read more...