Monoamniotic twin gestations result from a late division of the fertilized ovum with development of the two embryos within a common amnionic sac. We performed a retrospective study in our university hospital on nearly 19 years of clinical activities; we found 16 cases of monoamniotic twins. Obstetrical and neonatal outcomes were analyzed and compared to the data in the literature. The pronosis after 28 weeks of gestation does not appear to be influenced by this type of twin gestation and we demonstrate in this study that vaginal delivery is possible and not deleterious.
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