Prenatal diagnosis of twin–twin transfusion syndrome complicated with hydrops fetalis at 14 weeks of gestation

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Twin-twin transfusion syndrome (TTTS) may complicate multiple pregnancy. Monochorionic discordant twins with oligohydramnios and polyhydramnios may be diagnostic. Hydrops fetalis is particularly ominous. All the signs can appear independently at any stage of gestation. However, TTTS with hydrops fetalis in early pregnancy is rare. We report here a case of TTTS complicated with hydrops fetalis diagnosed at 14 weeks of gestation. Our case may be one of the earliest cases of the prenatal diagnosis of TTTS complicated with hydrops fetalis in the literature.