[Foetal rhinopharyngeal teratoma: antenatal diagnosis and prognosis. Case report].

Fetal teratomas are commonly found in the sacrococcygeal area. More rarely, these tumors may be found in cervicofacial forms. Rhinopharyngeal teratoma represent an extremely rare congenital tumor, often resulting in intracranial extension, obstruction of the respiratory or the digestive pathways and rapid asphyxia following birth. We report a case of rhinopharyngeal teratoma identified in a foetus at 18 weeks of gestation. The diagnosis was made by antenatal ultrasound and IRM. Tumor invaded the cavum and the right infratemporal region with no intracranial extension. The pregnancy was interrupted at 27 weeks of gestation. Authors discuss the difficulties to establish antenatal diagnosis by ultrasound, and those to decide what treatment to carry out.