Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are reasonably well expanded with improved small - to - moderate left pleural effusion and left - sided chest tube , incompletely assessed . No right - sided effusion is seen . The lungs are well expanded and clear with the exception of unchanged left perihilar opacification corresponding to the mass , better assessed on CT from ___ . Pulmonary congestion is improved . Cardiac silhouette is unchanged .
    OUTPUT:
    
Improved small - to - moderate left pleural effusion