Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . There is mild tortuosity of the descending aorta . There is redemonstration of bibasilar linear opacities which most likely represent atelectasis or scarring . Otherwise , lungs are well expanded . There is no focal consolidation , pleural effusion or pneumothorax . There is redemonstration of a calcified left upper lung granuloma .
    OUTPUT:
    
Bibasilar linear opacities most likely represent atelectasis or scarring , unchanged from prior .