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Fig. 2B. —Axial CT scans obtained through upper chest in 62-year-old man who presented with syncope and left-sided weakness. Unenhanced (A) and contrast-enhanced (B) CT scans reveal hypodense lumen with mural calcification of innominate artery with partial enhancement of lumen (arrow, B) in contrast-enhanced CT scan. Findings are consistent with high-grade partial occlusion of vessel.