Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The fact that the right cardiac contour is still minimally obscured suggests some degree of chronic atelectasis , but on the whole , although this area of minor opacification seems unchanged , opacities in the lower lungs have generally otherwise resolved . The lungs appear otherwise clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Minor persistent atelectasis or scarring in the lingula , but otherwise clear lungs .