Monochorionic twins can bediscordant 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 [5, 6] . TTTS is the most important cause of death and handicap in monochorionic twin pregnancies [9] . 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 Fig. Chorionicity determination in the first trimester. a Ultrasound image of a monochorionic diamniotic twin pregnancy: the twins are separated only by two thin layers of amniotic membrane (thin arrows). In dichorionic pregnancies, there are three layers separating the twins: two thin amniotic membranes. (thin arrows) with a thick layer of chorion in between (thick arrow).
Monochorionic twins can bediscordant 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 [5, 6] . TTTS is the most important cause of death and handicap in monochorionic twin pregnancies [9] . 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 Fig. Chorionicity determination in the first trimester. a Ultrasound image of a monochorionic diamniotic twin pregnancy: the twins are separated only by two thin layers of amniotic membrane (thin arrows). In dichorionic pregnancies, there are three layers separating the twins: two thin amniotic membranes. (thin arrows) with a thick layer of chorion in between (thick arrow).
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