Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The bibasilar airspace opacities have improved . There is no new consolidation or pleural effusion . Marked cardiomegaly is unchanged . The right subclavian dialysis catheter terminates in the right atrium . There is no pneumothorax .
    OUTPUT:
    
Improved bibasilar airspace opacities which may be due to infection or aspiration . Stable marked cardiomegaly .