Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . Vague upper lung opacities known to reflect architectural irregularity associated with emphysema appear similar to the prior radiographs . There has been no significant change . The lungs appear hyperinflated . There is no pleural effusion or pneumothorax . Mild loss in body heights among several mid thoracic vertebral bodies appears similar to the prior studies .
    OUTPUT:
    
Stable appearance of the chest .