Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear aside from a stable linear area of opacity in the right lower lobe which may be related to scarring or atelectasis . There is no evidence of pneumonia , pneumothorax , or pleural effusion . Cardiac silhouette is normal in size .
    OUTPUT:
    
Unchanged radiograph with no acute process . Linear scar versus atelectasis in the right lower lobe .