Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Minimal linear scarring or atelectasis is seen at the left lung base in the site of prior pneumonia . There is no new opacity and no pneumothorax or pleural effusion . Heart size is normal . Mediastinal silhouette and hilar contours are normal .
    OUTPUT:
    
Residual scarring or atelectasis at the left lung base at site of prior pneumonia .