Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung is well inflated with increased opacification of the right lower lobe , which is likely atelectasis . In appropriate clinical setting , a superimposed pneumonia should be considered . Left lung is clear . There is no pleural effusion or pneumothorax . Heart is still mildly enlarged . No evidence of rib fractures .
    OUTPUT:
    
Increased opacification in the right lower lobe , compatible with atelectasis though superimposed pneumonia might be considered in the appropriate clinical setting . No pneumothorax or pleural effusion .