Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP single view semi-erect chest x-ray shows interval improvement of bilateral pulmonary edema , now minimal , but still more severe to the right . Bilateral bibasilar pleural effusion is minimal ' Left base opacity is likely atelectasis . NG and ET tubes have been removed . Heart size is still mildly enlarged in patient with history of cardiac surgery as denoted by sternal wires . There is no pneumothorax .
    OUTPUT:
    
Improvement of bilateral pulmonary edema , now minimal . Persistent bibasilar small pleural effusion and left lower lobe atelectasis .