Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and show a left lower lobe mild patchy opacity . The cardiomediastinal silhouette and hilar contours are normal . No pleural effusion or pneumothorax is present . Partially imaged is an anterior cervical fusion device . No displaced rib fractures are noted .
    OUTPUT:
    
Left lower lobe mild patchy opacity likely represents atelectasis .