Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright portable radiograph of the chest demonstrates no evidence of pneumothorax or focal consolidation within the lungs . Bibasilar atelectasis is present . There is mild widening of the mediastinum , within normal limits after recent CABG . There has been interval removal of endotracheal tube , pericardial drain , nasogastric tube since the prior study . A right internal jugular venous catheter terminates in the low SVC .
    OUTPUT:
    
No evidence of pneumothorax . Expected postoperative changes after recent CABG .