Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The known opacification of the left lung shows mild interval improvement compared to previous imaging . Difficult to comment on the heart size . Right - sided IJV CVP in situ with the tip at the cavoatrial junction . The right lung is clear . No sinister bony lesion .
    OUTPUT:
    
Opacification of the left lung is still significant , but shows mild improvement compared to previous radiographs done yesterday .