Postnatal transient renal insufficiency in the feto-fetal transfusion syndrome

Twinning and higher-order multiple-gestation pregnancies have become relati vely frequent in the current era of assisted reproductive techniques. Vascu lar interconnections are present in nearly all monochorionic twin placentae , yet hemodynamically significant arteriovenous anastomoses resulting in th e fete-fetal transfusion syndrome occur in only 5%-18% of these. When arter iovenous connections through a shared placental cotyledon are present, vari able amounts of blood may be transfused from one fetus to the other, and fe te-fetal transfusion syndrome may result. While reports of renal failure du e to a small non-functioning kidney in the donor infant pre- or postnatally have been published, recoverable renal insufficiency has not been previous ly delineated in fete-fetal transfusion syndrome. This article de scribes a case of postnatal transient renal insufficiency in a donor infant from a p air of monozygotic twins.