Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The previously noted small right pleural effusion has decreased in size compared to the prior exam with only a trace amount of residual fluid noted . Adjacent atelectasis in the right lower lobe is re - demonstrated , but improved . No definite pneumothorax is detected . Remainder of the chest is unchanged . Left lower lobe mass is again noted . The cardiac , mediastinal and hilar contours are unchanged . Hyperinflation of lungs with attenuation of the pulmonary vascular markings towards the apices is compatible with emphysema .
    OUTPUT:
    
Decreased size of small right pleural effusion which is now trace , with no pneumothorax detected .