Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post coronary bypass graft surgery . A right - sided chest tube and central venous catheters appear unchanged . There is no definite demonstration of a pneumothorax on this study , although evaluation is somewhat limited by portable technique . The lung volumes are low with streaky left basilar opacities suggestive of minor atelectasis .
    OUTPUT:
    
No definite pneumothorax on this study .