Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Streaky bibasilar opacities likely represent atelectasis . Aside from this the lungs are clear . Heart size is normal . Mediastinal contour is remarkable for a tortuous descending thoracic aorta . No pleural effusion or pneumothorax . Osseous structures are intact .
    OUTPUT:
    
Bibasilar atelectasis . No evidence of pneumonia or visualized rib fracture .