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To report the treatment results of 16 monochorionic and diamniotic gestations cases, which had complications due to the twin-to-twin transfusion syndrome (TTTS), the neonatal and other possible complications of the septostomy associated to the amniodrainage.Based on ultrasonographic findings, 16 pregnant women were diagnosed with the twin-to-twin transfusion syndrome (TTTS). These cases were divided in two groups: one of them included the fetuses without hydrops and the second included the “recipient” fetuses with hydrops. The therapy measures included septostomy with or without amniodrainage. The following parameters were evaluated: gestational age at the time the septostomy was performed, volume of drained amniotic fluid, gestational age at delivery, birth weight, postnatal evolution, and procedure complications.The average gestational age for this procedure was of 23.6 weeks (from 14 weeks and 1 day to 33 weeks). The gestational age for the septostomy until the delivery was of 8.18 weeks (from 1.0 to 21.3 weeks). The survival rate in the group without hydrops was of 68.7%, while in the second group it was of 25%. Some of the complications were as follows: two cases of premature membrane rupture and one case of preterm labor.Septostomy with amniodrainage, when performed on the initial stages and on earlier gestational ages has good perinatal results.