A rare benign neoplasm of the placenta that usually has no significance is a chorangioma, as seen here bulging from the fetal surface. A larger chorangioma, like a large infarct, could impact fetal survival through loss of functional placental tissue. Increased blood flow through a large chorangioma could also lead to fetal heart failure with hydrops. Polyhydramnios (increased amniotic fluid volume) may occur. Thrombocytopenia may sometimes be observed at birth in the neonate.