Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac size is top normal . Right PICC tip is in the cavoatrial junction as before . Persistent right lower lobe opacity could be atelectasis but superimposed infection can not be excluded , otherwise the lungs are clear . There is no pneumothorax or pleural effusion . Blunting of the left CP angle is unchanged
    OUTPUT:
    
Persistent opacity in the right lower lobe is likely atelectasis but superimposed infection can not be excluded .