Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right heart border is obscured with opacification of the lower half of the right hemithorax . This most likely reflects pleural effusion and substantial volume loss of the right lower lung . In the appropriate clinical setting , superimposed pneumonia is considered . In addition , there are streaks of atelectasis at the left lung base . Osseous structures are unremarkable .
    OUTPUT:
    
1 . Opacification of the lower right hemithorax likely reflects pleural effusion and substantial volume loss in the right lower lobe . In the appropriate clinical setting , superimposed pneumonia is considered .