What are the indications?
Most common reason is evaluation of the bleeding in or around the brain resulting from the rupture of arterial aneurysm. The other indications include surgical mapping for brain tumours or vascular malformation.
Same as for general angiography
Is there any additional risk?
The procedure lasts longer than general angiogram and is more invasive. Placement of the angiographic tube into the neck arteries supplying the brain may cause damage of the vessel, formation of clot and possibly stroke. This usually happens in patients with pre-existing vascular disease and will necessitate admission into Intensive Care Unit. With high resolution imaging systems, this complication occurs very seldom. The radiologist will discuss with you if your particular case falls into higher risk category.