Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear unchanged including slight calcification along the aortic arch . Patchy left basilar opacity appears unchanged and suggests minor atelectasis or scarring . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No evidence of acute disease .