Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear bibasilar opacities most likely represent atelectasis . No consolidation pulmonary edema , pleural effusion or pneumothorax . The cardiac and mediastinal contours are normal . There is no free air beneath the right hemidiaphragm .
    OUTPUT:
    
Mild bibasilar atelectasis . No pneumonia .