Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: With the aortic graft , sternal wires , widened mediastinum , bilateral IJ central lines , are unchanged . There is improved aeration bilaterally with decrease in bilateral effusions . There continues to be retrocardiac opacity and small bilateral effusions but the overall appearance of the lungs is much improved the NG tube tip is off the film , at least in the stomach .
    OUTPUT:
    
No new infiltrate .