[Antenatal diagnosis and management of vein of Galen aneurysm: review illustrated by a case report].

Vein of Galen aneurysm is a rare vascular congenital malformation. We report an antenatal diagnosis with duplex Doppler at 26 weeks gestation. Magnetic resonance imaging was used before and after delivery in order to determine neurological prognosis. The neonatal prognosis is poor if fetal cardiac insufficiency or cerebral lesions are present antenatally. Premature delivery does not improve the neonatal outcome. When the aneurysm is not life threatening, embolization of the malformation is at best delayed five months after birth.