Differential diagnosis for fetus with hydrops?

Hydrops fetalis (HF) Hf is divided into two major categories: immune hf and nonimmune hf. Immune hydrops fetalis is caused by rh incompatibility, and used to be the most common cause. All other causes of hf are termed non-immune and may be caused by chromosomal aberrations, other genetic disorders, infections, anemias, structural birth defects such as congenital heart disease, and many other causes.