Chorioangiomas are benign tumours of the placenta that do not pose significant threat to the pregnancy in the vast majority of the cases. However, when they are relatively large (>5cm), they may affect the pregnancy in two ways: they act as bypass channels for blood circulation causing excess workload on the fetal heart leading to heart failure; they act as trap to entrap fetal red blood cells causing fetal anaemia Depending on the type of problem caused by the tumour, we offer two types of therapy: if anaemia is significant, direct fetal blood transfusion; if heart failure is present without severe anaemia, we offer tumour embolization. In tumour embolization, a special glue is injected into the main vessel that ‘feeds’ the tumour thereby occluding the blood supply. This is also done on an outpatient basis using a fine needle. Typically, the procedure takes about half an hour followed by one hour of observation.