What are the indications?
Most common reason is evaluation if the blocked or narrowed arteries in the neck are the cause for the stroke. The other indications include surgical mapping for neck tumours or vascular malformation.
Same as for general angiography.
Is there any additional risk?
Placement of the angiographic tube into the neck arteries 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.