Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The hilar and mediastinal contours are normal . Linear bibasilar opacities , more pronounced at the left lung base , are compatible with atelectasis . There is no pleural effusion or pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Bibasilar atelectasis . No focal consolidation .