Selective Delivery of an Acardiac, Acephalic Twin

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Abstract
THE acardius fetal malformation, occurring once in every 35,000 births, was first described by Benedetti in an account published in 1533.1 This rare, lethal malformation of one of twin fetuses has four main types: acardius acephalus, in which there is an absence of the fetal head and thoracic organs; acardius acormus, in which there is development of the fetal head only; acardius amorphus, in which there is only a shapeless mass of tissue without a recognizable human part; and acardius myelacephalus, in which there is a suggestion of one or more extremities and a partially developed head. The anomaly is . . .