The carotid arteries carry blood to the brain. A yellow fatty substance called plaque can build up on the inside of the artery causing a blockage or 'stenosis' and can affect the blood flow. If severe, this can result in a stroke. Your provider may order an imaging test such as an ultrasound to confirm the blockage. If the testing confirms a blockage, your provider will discuss different treatment options such as a Carotid Endarterectomy.