Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unremarkable . Linear opacities in the lung bases are compatible with subsegmental atelectasis . No pleural effusion or pneumothorax is present . No displaced rib fractures are noted .
    OUTPUT:
    
Bibasilar atelectasis . No displaced rib fracture visualized . If there is continued concern for rib fracture , then a dedicated rib series can be obtained .