Twin-twin transfusion syndrome: rapid development of severe hydrops of the donor following selective feticide of the hydropic recipient.

Twin-twin transfusion syndrome is a serious complication of monozygotic twin pregnancies and is associated with high rates of perinatal morbidity and mortality. Unfortunately, therapies to disrupt the arteriovenous anastomoses are limited, and the success rate of these therapeutic modalities are poor. We present a case of severe twin-twin transfusion syndrome at 23 weeks' gestation in which selective feticide of the recipient hydropic twin by intracardiac injection of potassium chloride was followed by rapid development of hydrops in the donor twin.