Aneurysmal dilation of the vein of Galen and straight sinus with resultant obstructive hydrocephalus

Description 

A 20-year-old woman was admitted to the emergency department on a previous occasion with tonic-clonic seizures. Her medical history was significant for headaches and hypertension. The headaches were associated with nausea and vomiting. She had no history of developmental delay or epilepsy. CT scan of the brain showed signs of obstructive hydrocephalus due to venous hypertension as a result of vein of Galen malformation, and hence a ventriculoperitoneal shunt was placed. Now on follow-up, her MRI brain demonstrates a round flow void in the suprapineal cisterns with engorged straight sinus, compatible with vein of Galen arteriovenous fistulous communication and shunting (figure 1). The resultant venous hypertension leads to mild to moderate compensated hydrocephalus.

Figure 1

(A) Axial T2, (B) axial T1 and (C) sagittal T2 MRI brain. MRI brain demonstrates a round flow void in the suprapineal cisterns with engorged straight sinus (green arrow),...

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