Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded with left lower lobe atelectasis or possible scar . Linear right lower lobe atelectasis noted . Lungs are otherwise clear . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable . Visualized upper abdomen is unremarkable .
    OUTPUT:
    
Left lower lobe atelectasis or possible scar . No evidence of pneumonia .