Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size remains top normal . Mediastinal and hilar contours are unremarkable . Lungs are hyperinflated with emphysematous changes and bullas again noted , most pronounced in the right apex . Aeration of the lung bases has improved compared to the previous exam , with minimal residual streaky opacities suggestive of atelectasis . No pleural effusion or pneumothorax is present . There is no evidence for pulmonary edema .
    OUTPUT:
    
Interval improvement in aeration of the lung bases with persistent streaky opacities suggestive of residual atelectasis . Bullous emphysema , most pronounced in the right apex .