Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . Some mild pulmonary vascular congestion but no pulmonary edema . The cardiomediastinal contours are slightly enlarged as expected postoperatively . There is mild pneumomediastinum as expected postoperatively . Acute median sternotomy wires are intact . Mitral valve prosthesis is intact . There is been interval placement of an ET tube that terminates approximately 5 cm from the carina . Interval placement of right IJ swans Ganz catheter terminating in the right pulmonary artery . Interval placement of an enteric tube with sideport beyond the esophagogastric junction and tip in the fundus . Left chest tube is seen projecting over the mid lung .
    OUTPUT:
    
Stable postoperative changes . No significant pulmonary edema . No evidence of pneumonia .