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Fig. 2A —CT angiograms of supraaortic arteries. Four maximum intensity projections (30 mm) in coronal plane in four patients. CT angiographic scans in caudocranial direction with right-sided (72-year-old man, A) and left-sided (74-year-old woman, B) injection of contrast material. Very high density of contrast material in subclavian vein and superior vena cava hides origin of supraaortic arteries.