Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Persistent bibasilar opacities , unchanged since prior examination . Moderate right parapneumonic effusion has slightly decreased in size . No left pleural effusion . No pneumothorax . Partially visualized heart is top - normal in size and obscured due to overlying parenchymal abnormality . Mediastinal contour and hila are unremarkable . A right chest tube is coiled within the effusion .
    OUTPUT:
    
Mild decrease in size of moderate right parapneumonic effusion .