Day 7 ( as an outpatient )
Right parietal V-P shunt.
Huge left parieto-occipital arteriovenous malformation measuring 6.5 cm with significant surrounding gliosis. Flow-voids in keeping with partial calcification of the AVM.
The arterial feeders arise from an enlarged left posterior cerebral artery, enlarged pericallosal artery and smaller calibre vessels from the posterior branch of the left middle cerebral artery.
The draining vein measures 7 mm going directly into the straight sinus.
Huge number of dilated surface veins, best appreciated on SWI images.
Large number of dilated veins anterior to the pons and brainstem and extending into the intradural, perimedullary space from C2-T1.
Additional 2.2 cm ''mesh'' of smaller cortical vessels in the right parietal lobe at the site of the V-P shunt insertion.
No hydrocephalus. High T2 signal in the periventricular white matter of the frontal horns.