“…There is still a high mortality despite such attempts to reduce the vascularity of these tumors, and perhaps, this is because of their ability to develop rapidly a collateral blood supply. Most authors conclude that if fetal intervention is to be a success, then it should be implemented before the development of high-output cardiac failure, and therefore, the clear task should be to discriminate such fetuses at an earlier stage [7,[21][22][23][24][25].…”