One of the more common arteries impacted by atherosclerotic disease is the carotid artery. This artery provides blood to the brain. Most people are asymptomatic of any partial blockage. However, if the artery becomes completely occluded or if parts of the plaque break off many patients will suffer from strokes. Initial diagnosis consists of a carotid ultrasound. Once the percentage of stenosis is determined to be severe this can be fixed using a stent or open surgery. Most patients requiring surgical treatment will have a carotid endarterectomy. However, some patients are too sick to undergo an open surgical procedure. These patients benefit from carotid stenting. The stent is a metal cage inserted into the vessel to prop open the carotid artery.