What workup should we require for a patient who has had one TIA and demonstrates 80% carotid stenosis?

The workup that I would recommend of a patient with a single TIA and an 80% carotid stenosis would include carotid ultrasound combined with MRA. If these studies correlated, then I would proceed with carotid endarterectomy after medicine or cardiology consultation and workup for coronary artery disease.