Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is normal in size . The aorta is diffusely tortuous without change . Lungs are clear except for linear foci of scarring or atelectasis within the lung bases . No pleural effusion or pneumothorax . A healed left rib fracture incidentally noted , without change .
    OUTPUT:
    
Bibasilar focal linear atelectasis or scar with otherwise clear lungs .