[Prenatal diagnosis of a sacrococcygeal teratoma with hydrops fetalis and placental hypertrophy--consequences for the further course of pregnancy].

A fetal sacrococcygeal teratoma may cause hypertrophy of the placenta and fetal hydrops. This is dangerous for the fetus and also for the mother. The maternal risk results from preeclampsia and respiratory insufficiency, associated with elevated beta-HCG. In that case, pregnancy should be terminated by caesarean section due to maternal reasons.