Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A bedside AP radiograph of the chest once again demonstrates a moderate left pleural effusion with interval increase in the opacification of the left lower lobe . The left upper lobe and the right lung are clear . There is no pneumothorax or right - sided pleural effusion . The heart is top normal in size , stable . Pulmonary vascularity is normal .
    OUTPUT:
    
Stable moderate left pleural effusion with interval increase in left lower lobe opacity . This may represent worsening compressive atelectasis ; however , consolidation due to an infectious process can not be ruled out .