[Intrapericardial teratoma in the neonatal stage: diagnosis and evolution].

Intrapericardial teratomas in fetal and neonatal stages are rare. They invade the mediastinum compromising the venous return to the heart and leading to hydrops. We report a case of a neonate with fetal hydrops who required ventilatory support at birth and urgent surgical treatment due to severe respiratory failure. During surgery, a multicyst mass was resected in the anterior mediastinum, corresponding to an immature teratoma.