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Unenhanced CT of the aorta shows thick irregular parietal atherosclerotic plaques. The angiographic phase displays an extensive saccular dilatation of the descending aorta with thick mural thrombus of semilunar shape. Slight displacement of the left tracheobronchial tree. No evidence of rupture or aortic dissection. The spleen shows multiple punctiform calcifications. Liver. pancreas, kidneys and adrenal glands within normal limits