Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post coronary artery bypass graft surgery with mitral valve replacement . A right internal jugular central venous catheter terminates in the mid superior vena cava . Other lines tubes and drains had been removed . Retrocardiac opacification has largely cleared . Pleural effusions have probably also decreased somewhat . . Sternal wires appear intact . There is a small focus of air immediately posterior to the sternum . However , this may be anticipated in the early postoperative course .
    OUTPUT:
    
Small focus of air / gas immediately posterior to the sternum without evidence for bone destruction or dishiscence of sternal wires . Although it is hard to exclude the possibility of gas - forming infection , the presence of gas in soft tissues can be anticipated following very sternotomy . Improving left basilar opacity and probable decrease in bilateral pleural effusions .