Sacrococcygeal teratoma is the most common congenital tumor of the fetus, consisting of all three germ cell layers. These layers are commonly large and vascular, causing the blood to be shunted to the tumor. This creates the vascular steal syndrome, resulting in fetal hydrops and cardiac failure. Large tumors may also cause polyhydramnios, resulting in premature labor. Treatment options include open fetal surgery and radio frequency ablation, as well as complete tumor resection following delivery. Serial sonographic examinations are important in the management of the pregnancy, from diagnosis to treatment and delivery.
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