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Fig. 7A —47-year-old man taking anticoagulation therapy 27 months after aortic arch replacement for chronic type A aortic dissection. Axial (A and B) and sagittal reformatted (C) CT scans obtained because of clinical suspicion of mediastinal hematoma and infection show active contrast extravasation (white arrows) arising from cannulation site in graft and extending into sternotomy defect in anterior chest wall. Leak and infection at cannulation site were confirmed at subsequent surgical repair. Straight black arrows indicate distal graft anastomosis; arrowhead (A), felt pledget at cannulation site; curved arrows (A and B), dissection flap in native aorta.