The "Vanishing Twin": Ultrasonographic Assessment of Fetal Disappearance in the First Trimester

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Landy, M.D., H., Weiner, M.D., S., Corson, M.D., S.

Review of the sonographic findings of 1000 pregnancies with viable gestations in the first trimester revealed a minimum incidence of twinning of 3.29%. Of these, 21.9% demonstrated the “vanishing twin” phenomenon, often with associated bleeding, but with a good prognosis for the remaining fetus. Ovulation induction did not appear to alter these data. The sonographic criteria for “vanishing twin” are discussed. The incidence of multiple gestation is 3.29% to 5.39%, higher than previously believed. (Am J Obset Gynecol 1986;155:14-9.)

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