Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is left basilar opacity . The lungs are otherwise clear . Cardiomediastinal silhouette is within normal limits . Surgical clip projects over the thoracic inlet on the left . Posterior cervical fixation hardware is partially visualized .
    OUTPUT:
    
Left basilar opacity which could be due to to either atelectasis or infection , to be correlated clinically .