Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The contour of the aortic arch is prominent with calcification and tortuosity , but otherwise the mediastinal and hilar contours are unremarkable . There is patchy left basilar opacity , which can probably be ascribed to atelectasis . Lesser right infrahilar opacity is probably also due to minor atelectasis . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Somewhat prominent aortic arch which may constitute aneurysmal dilatation . Chest CT should be considered to evaluate further when clinically appropriate although findings are unlikely to account for acute presentation .