Twin pregnancy: case reports illustrating variations in transfusion syndrome

The twin transfusion syndrome is diagnosed in 5.5% to 14.6% of monochorionic twins and the classical picture reveals a small anemic donor and a large plethoric recipient. Many other clinical discrepancies have been described. Today, by ultrasound it is possible to diagnose the syndrome in (early) pregnancy. In these case reports different clinical pictures and the importance of ultrasound are described. In twin pregnancies repeated ultrasound examinations should be considered with the consequences of vascular anastomoses.