Carotid artery angioplasty and stenting is a minimally invasive medical procedure used to treat carotid artery stenosis, a narrowing of the carotid arteries due to plaque buildup. The procedure involves inserting a catheter with a balloon at its tip into the narrowed artery and inflating the balloon to widen the artery. A stent is then placed to keep the artery open and improve blood flow to the brain.