[Intrauterine death of one fetus during the first trimester in multiple gestation]

This study is a prospective review of 136 multiple gestations identified sonographically in the first trimester. Of these, 35 (25.7%) demonstrated the "vanishing twin" phenomenon, often with associated bleeding. The prognosis for the remaining fetus/fetuses was a good in dichorionic and bad in monochorionic twin pregnancy.