Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph demonstrates interval increase in bibasilar opacities , likely reflecting atelectasis . There is mild pulmonary edema . Multiple new nodules are not well appreciated on plain radiograph . The patient 's known lymphadenopathy is better appreciated on chest CT . Surgical clips are seen adjacent to the trachea .
    OUTPUT:
    
Bibasilar atelectasis and mild pulmonary edema . Refer to chest CT performed subsequently for further information .