Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . The moderate - to - large left pleural effusion has increased . The small right pleural effusion is either unchanged or increased . There is mild pulmonary vascular congestion . Moderate cardiomegaly is likely unchanged . The mediastinal and hilar contours are stable . Underlying left lower lobe or right lower lobe opacity representing pneumonia can not be ruled out .
    OUTPUT:
    
1 . Increased moderate - to - large left pleural effusion and small right pleural effusion . 2 . Left lower lobe or right lower lobe pneumonia can not be ruled out .