Snapshot A 34-year-old woman presents to the emergency department with constant and severe right-sided headaches. One day prior to presentation, she was in a minor motor vehicle accident where her head jerked forward. She has also noticed mild eye-lid drooping earlier in the day. She smokes approximately 2-3 cigarettes per day. On physical exam, she has right-sided ptosis and miosis without anhydrosis. A non-contrast CT scan and CT angiography is performed, which demonstrates a tapered stenosis of the internal carotid artery and an intimal flap. Introduction Definition login to view 3 more bullets Epidemiology Risk factors login to view 1 more bullet ETIOLOGY Pathogenesis login to view 4 more bullets Presentation Classic triad login to view 5 more bullets Symptoms login to view 5 more bullets Physical exam login to view 4 more bullets Imaging Magnetic resonance angiography login to view 7 more bullets Differential Migraine login to view 2 more bullets Treatment Medical login to view 6 more bullets Operative login to view 3 more bullets Complications Ischemic stroke Prognosis Unfavorable factors login to view 3 more bullets