A dichorionic diamniotic twin pregnancy was obtained by in vitro fertilization, in a 31 year old primigravida, with a history of endometriosis and antiphospholipid syndrome, revealed by several thrombo-embolic events on treatment by low-molecularweight heparin. The pregnancy was complicated by threatened preterm labor at 29 and 32 weeks’ gestation and was hospitalised for tocolytic (atosiban) a...