The abnormal accumulation of fluid in two or more fetal compartments, including ascites, pleural effusion, pericardial effusion, and skin edema.
Comment:
The most common causes of hydrops fetalis are hematologic (including isoimmunization because of Rhesus incompatibility and other causes), hereditary hemolytic disorders, fetal hemorrhage, disorders of red cell production), cardiovascular disorders, infections, certain intrathoracic malformations, and idiopathic forms.