Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is interval improvement in the left - sided pleural effusion . There is also now visualization of part of the left heart border which may be due to either partial left upper lobe reexpansion or compensatory hyperexpansion of the left lower lobe . Remainder of the chest radiograph is stable compared to prior exam . There is no pneumothorax .
    OUTPUT:
    
1 . Improved left pleural effusion .