Monochorionic twins can be discordant in amniotic fluid volume,in size,in the presence of congenital abnor malities and in hemoglobin concentration.Severe amniotic fluid discordance is typical for TTTS, which complicates 8–10% of monochorionic twin gestations, usually between 16 and 26 weeks . TTTS is the most important cause of death and handicap in monochorionic twin
pregnancies.Its sonographic diagnosis is based on strict criteria of amniotic fluid discordance.Most European centers adhere to gestational-age-dependent criteria to define polyhydramnios in the recipient sac:deepest vertical pocket 8 cm prior to 20 weeks and 10 cm after
20 weeks.In contrast, in the United States, the 8-cm cutoff is used more often throughout gestation .Both continents agree on the definition of oligohydramnios in the donor’s sac (2cm deepest vertical pocket)
Monochorionic twins can be discordant in amniotic fluid volume,in size,in the presence of congenital abnor malities and in hemoglobin concentration.Severe amniotic fluid discordance is typical for TTTS, which complicates 8–10% of monochorionic twin gestations, usually between 16 and 26 weeks . TTTS is the most important cause of death and handicap in monochorionic twin pregnancies.Its sonographic diagnosis is based on strict criteria of amniotic fluid discordance.Most European centers adhere to gestational-age-dependent criteria to define polyhydramnios in the recipient sac:deepest vertical pocket 8 cm prior to 20 weeks and 10 cm after 20 weeks.In contrast, in the United States, the 8-cm cutoff is used more often throughout gestation .Both continents agree on the definition of oligohydramnios in the donor’s sac (2cm deepest vertical pocket)
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