Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . Mediastinal and hilar contours are unremarkable . Lung volumes are low which causes crowding of the bronchovascular structures , but there is no evidence of overt pulmonary edema . Patchy opacities in the lung bases likely reflect areas of atelectasis . No pleural effusion or pneumothorax is present . Bilateral pleural thickening or subpleural fat is noted laterally . Multilevel degenerative changes are seen throughout the thoracic spine . No displaced fractures are visualized .
    OUTPUT:
    
Mild bibasilar atelectasis . No displaced fractures are visualized .