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Figure 7.8:Twin-twin transfusion syndrome in a monochorionic twin gestation showing the presence of polyhydramnios in the recipient sac (A) and oligohydramnios in the donor sac (B). Note the wrapping of the amniotic membrane (arrows in B) around the body of the donor twin.
Chapter 7: Ultrasound Evaluation of Twin Gestations 144Ultrasound is essential to the diagnosis and management of TTTS. Criteria for establishing the diagnosis of TTTS by ultrasound include a monochorionic placenta, polyhydramnios in one sac with a maximum vertical pocket of equal to or greater