In this add on procedure, the provider performs imaging supervision and interpretation for angiography performed by inserting catheter in additional branches of the intracranial subdivisions of the internal carotid or vertebral arteries. He performs angiography of circulation of the middle cerebral artery and posterior inferior cerebellar artery during the same session that he places a catheter and performs angiography of the internal carotid or common carotid artery.
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