Hydrops fetalis was detected on a routine antenatal ultrasound. The patient's blood group was O negative and she was not administered Rh antibody during the first pregnancy, which ended in an uneventful normal delivery.
The diagnosis of hydrops fetalis requires the presence of fluid or edema in two or more fetal compartments. In this case - subcutaneous edema and ascites. Placentomegaly and polyhydramnios are in seen in more severe cases of hydrops.