The "vanishing twin": ultrasonographic assessment of fetal disappearance in the first trimester

Am J Obstet Gynecol. 1986 Jul;155(1):14-9. doi: 10.1016/0002-9378(86)90068-2.


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, 21.2% 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.

MeSH terms

  • Diagnostic Errors
  • Female
  • Gestational Age
  • Humans
  • Ovulation Induction
  • Pregnancy
  • Pregnancy Complications, Cardiovascular
  • Pregnancy Trimester, First
  • Pregnancy, Multiple*
  • Twins*
  • Ultrasonography*
  • Uterine Hemorrhage