Vein of Galen aneurysmal malformation: Pit-falls in the diagnosis.

Vein of Galen aneurysmal malformation (VGAM) is a rare congenital vascular malformation. We report a case of VGAM being associated with presence of bilateral hydrocephalus, gross cardiomegaly and is unique in two ways. Firstly, clinical presentation was associated with a large discrete cystic swelling along right side of the neck, which has not previously been reported. Secondly, this was a missed diagnosis of VGAM due to omission of colour Doppler study while performing diagnostic fetal cranial ultrasound just prior to delivery, following referral for assessment on a previously identified abnormality.