[Single live-birth after twin conception].

The authors discuss the pregnancy outcome following the demise of one or more embryos or fetuses of the set of a multiple pregnancy. The consequences depend, to great extent, upon the time of the intrauterine demise. Sonographic examination identifies the empty chorionic sacs when death of embryos occurred during the first trimester. Circulatory disturbance at the time of early embryogenesis led to the formation of a fetus acardius amorphus. One fetus died during the second trimester and careful sonographic search revealed laterally displaced fetus papyraceous. An other growth retarded, dead, small fetus was found closely attachd to the uterine wall (stuck twin). All these complications caused spontaneous fetal reduction in multiple gestations.