**3.1 Intrauterine diagnosis**

The majority of SCT present between the 22nd and the 34th week of gestation. The diagnosis of SCT on routine US is associated with a greater than expected incidence of prenatal and perinatal complications. Close antenatal follow up is needed to optimize patient counselling and treatment in the presence of a completely solid tumor and the onset of polyhydramnios. A poor outcome is usually correlated with placentomegaly, cardiomegaly or non-immune hydrops fetalis.
