Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with study of ___ , there has been some decrease in the still significant opacification at the right base . There may also be some improvement in the opacification at the left base . There is a left effusion and possibly a small right one as well . The upper zones are essentially clear . Mild pulmonary vascular congestion is again seen .
    OUTPUT:
    
Some improvement in the still substantial multifocal opacifications .