Vein of Galen aneurysm.

Background: AV malformation of the vein of Galen, also known as vein of Galen aneurysm, is an intracranial anomaly characterised by a midline, high flow lesion with a complex vascular architecture. It compromises less than 1% of all cerebral arteriovenous malformations seen in adults and children. Timely diagnosis of the malformation is of importance particularly during the perinatal period due to the large systemic shunting within the fetal brain potentially leading to cardiac failure, hydrops and perinatal death.