[Monozygotic triplet pregnancy after transfer of frozen embryos]

We report a case of monozygotic triplet pregnancy after transfer of 3 frozen thawed embryos. The pregnancy ended by the birth of 3 healthy normal boys and all the analysis showed that it was really a monochorionic triamniotic triplet pregnancy, that as far as we know is the first reported one induced by frozen thawed technics. We shall discuss: the etiology of monozygotic pregnancies after IVF; the sonographic diagnosis of placentation; the obstetrical care which allowed the birth of 3 healthy normal boys.