Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderate enlargement of the cardiac silhouette is unchanged . Mediastinal and hilar contours are within normal limits . Pulmonary vascularity is normal . Biapical scarring is re - demonstrated . There is no focal consolidation , pleural effusion or pneumothorax . Streaky left basilar opacity is likely reflective of atelectasis . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Mild left basilar atelectasis .