Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates slight interval improvement in aeration of the right lung . There is continued near complete opacification of the left hemi thorax , secondary to large pleural effusion and compressive atelectasis . There is a small area of persistently aerated lung in the left upper thorax . As before there is a moderate right - sided pleural effusion with some adjacent atelectasis . There is no pneumothorax . Note is made of a chronic right anterior shoulder dislocation , which is unchanged .
    OUTPUT:
    
Slight interval improvement in aeration of the right lung . Continued near complete opacification of the left hemi thorax secondary to large pleural effusion and compressive atelectasis .