Re A (conjoined twins) Re A (conjoined twins) Re A (conjoined twins) [2001] 2 WLR 480 is a Court of Appeal decision on the separation of conjoined twins. The case raised several legal, ethical and religious dilemmas including whether it would be permissible to kill one of the children to save the other, and whether it was permissible to act against the wishes of the twins' parents. Gracie and Rosie Attard, who were born on 8 August 2000, were conjoined twins who were joined at the abdomen. During legal proceedings, the twins were given the public pseudonyms "Jodie" and "Mary", respectively. The medical evidence
Monochorionic twins Monochorionic twins Monochorionic twins are monozygotic (identical) twins that share the same placenta. If the placenta is shared by more than two twins (see multiple birth), these are monochorionic multiples. Monochorionic twins occur in 0.3% of all pregnancies. 75% of monozygotic twin pregnancies are monochorionic; the remaining 25% are "dichorionic diamniotic". If the placenta divides, this takes place after the third day after fertilization. Monochorionic twins generally have two amniotic sacs (called Monochorionic-Diamniotic "MoDi"), but sometimes, in the case of monoamniotic twins (Monochorionic-Monoamniotic "MoMo"), they also share the same amniotic sac. Monoamniotic twins occur when the split takes place after