Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Multiple left - sided rib fractures are again seen , without any significant change . The right lung is clear . No pneumothorax is seen . Unchanged left lower lung opacity likely representing a combination of effusion and atelectasis .
    OUTPUT:
    
Left lower lobe opacity likely from effusion and atelectasis is unchanged . Right lung is clear . No pneumothorax . The rib fractures are not significantly changed .