[A voluminous sacrococcygeal teratoma: prenatal diagnosis, in-utero treatment and obstetric management].

Sacrococcygeal teratoma is the most common and benign fetal tumor. Fetuses with sacrococcygeal tumors that are predominantly solid and highly vascularized have a high risk of fatal issue. Hydrops and tumor hemorrhage are associated with a highest risk of fetal death. Management of these tumors includes ultrasound scan with Doppler and magnetic resonance imaging (MRI) is usually used for evaluation of its intrapelvic extension and relationship to the other structures. New in-utero treatments as vascular coagulation have been applied in fetuses with highly vascular teratomas but these techniques are still experimental and need more investigations. The management of delivery depends on associated anomalies, tumor vascularity and size.