Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is moderately enlarged . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is not engorged . Minimal patchy opacities in the lung bases likely reflect atelectasis . No pleural effusion or pneumothorax is seen . No acute osseous abnormality is detected . Degenerative changes are noted involving both acromioclavicular joints .
    OUTPUT:
    
Minimal bibasilar atelectasis . No acute cardiopulmonary abnormality otherwise demonstrated .