Sonographic sign for the detection of early fetal ascites in the management of severe isoimmune disease without intrauterine transfusion.

Ultrasonography is an important adjunct to the delta optical density at 450 nm in the management of isoimmunized pregnancies. We describe a sonographic finding that we believe is the earliest sign of fetal ascites suggesting decompensation. In this patient, despite high measurements of delta optical density at 450 nm, intrauterine therapy or delivery was delayed for more than 7 weeks by careful sonographic monitoring.