Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is again at the upper limits of normal size . The aortic arch is partly calcified . The mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . A new band - like opacity projecting over the left mid lung suggests minor atelectasis or scarring in the lingula . Otherwise , lungs remain clear . The bony structures are unremarkable .
    OUTPUT:
    
No evidence of acute disease .