Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube is terminates in the lower trachea . A right IJ central venous catheter extends into the upper right atrium . The nasogastric tube terminates in the stomach . Stable retrocardiac airspace opacification is likely due to a combination of atelectasis and infection . The left costophrenic angle has been excluded from the field of view . However , a small left pleural effusion is essentially unchanged . The previous right pleural effusion has decreased with improved aeration of the right lower lobe . Bilateral perihilar airspace opacities have decreased since the prior exam .
    OUTPUT:
    
Improved aeration at the right base with stable retrocardiac atelectasis or infection . Stable small left pleural effusion . Lines and tubes in satisfactory position .