Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A central venous catheter terminates in the right atrium . The patient is status post coronary artery bypass graft surgery . The heart is normal in size . The mediastinal and hilar contours appear unchanged . Hazy predominantly central opacification suggests mild fluid overload , and streaky new right basilar opacities can probably be attributed atelectasis . There is no definite pleural effusion or pneumothorax . There is no free air .
    OUTPUT:
    
No free air identified . Findings suggest mild fluid overload and minor right basilar atelectasis .