Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the chest x-ray of yesterday , new opacification on the left lung base , compatible with layering pleural effusion . Persistent bibasilar atelectasis is unchanged since prior chest x-ray . Cardiac contour is partially obscured by left pleural effusion . There are no consolidations suspicious for pneumonia . There is small left apical pneumothorax .
    OUTPUT:
    
New left base opacity is consistent with layering pleural effusion . Persistent bibasilar atelectasis . Small left apical pneumothorax .