[Sacrococcygeal teratoma. Prenatal diagnosis and prognosis].

The routine use of ultrasonics during pregnancy allows an early diagnosis of a sacrococcygeal teratoma (SCT) with a high degree of certainty. The perinatal management is shown in a four case example prenatally diagnosed. The assessment of N-Acetylcholinesterase in the amniotic fluid in cases of cystic teratomas does not allow a safe differentiation from a myelomeningocele. A puncture of the tumor can be helpful for the verification of the diagnosis. Cells of all three germ layers may be found in the cytological fluid. The sonomorphological differentiation into solid and cystic tumors may play a significant role for the intrauterine growth. Even when diagnosed very early, cystic tumors do not compromise the intrauterine growth. Large solid tumors may lead to hydrops fetalis and intrauterine death. Furthermore, the prognosis depends on concomitant malformation as well as on the intracorporal spreading of the tumor. Therefore, a careful ultrasonic examination allows a good prenatal prognosis as to the severity of the malformation. Delivery is done by caesarean section in cases of large cystic-solid tumors. Small teratomas as well as most cystic tumors allow vaginal delivery after having been punctured previously.