Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Stable postoperative mediastinal silhouette . Mild elevation of the right hemidiaphragm is unchanged . Median sternotomy wires are intact . Hilar contours are unremarkable . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality .