Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unchanged , with the heart size within normal limits . Lungs remain hyperinflated with mild emphysematous changes most pronounced in the apices . Scattered linear opacities are noted within the lung bases likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . There are mild degenerative changes in the thoracic spine . Remote bilateral rib fractures are noted .
    OUTPUT:
    
No radiographic evidence for pneumonia . Mild bibasilar atelectasis and mild emphysema .