Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy . Very shallow inspiration . Probable tiny left pleural effusion , similar . Bibasilar opacities have improved . Central line has been removed . No pneumothorax . Increased heart size . Normal pulmonary vascularity . New
    OUTPUT:
    
Small left pleural effusion . Improved bibasilar opacities