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 . There are patchy opacities in both lower lungs that are unchanged and suggest minor atelectasis or scarring . The lungs are hyperinflated . A stent within the trachea appears unchanged . There is no pleural effusion or pneumothorax . Mild degenerative changes are similar along the thoracic spine with small anterior osteophytes .
    OUTPUT:
    
No evidence of acute disease . Stable appearance of the chest .