Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest are compared to previous exam from ___ . When compared to prior , there is interval improvement in the appearance of the left hemithorax now with aerated left upper lobe . There is , however , a large left - sided pleural effusion . There is also no significant aeration of the left lower lobe suggesting underlying atelectasis , possible consolidation . The right - sided pleural effusion has also likely decreased in size since prior . Right basilar infection is not excluded . Cardiomediastinal silhouette is difficult to assess given dense opacity in the left lung . Left subclavian line and NG tubes are no longer seen .
    OUTPUT:
    
Large left - sided pleural effusion with increased aeration of the left upper lobe when compared to prior . Decrease in size of right - sided pleural effusion . Presumed left lower lobe and right base atelectasis with infection not excluded .