Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to the previous radiograph , no unfavorable change . Stable postoperative changes in the lungs bilaterally , and post surgical changes of the right hilum . Sternotomy wires and dual lead defibrillator are in standard position . No acute focal consolidation , interstitial edema , or pneumothorax . A trace left - sided effusion is seen .
    OUTPUT:
    
Very small left - sided effusion . Otherwise no acute interval change .