Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . No pneumothorax . Normal post operative appearance with left perihilar opacity suggesting resolving hemorrhage . The left hemidiaphragm is elevated with adjacent atelectasis and possible trace left pleural effusion . The mediastinum and cardiac borders are normal .
    OUTPUT:
    
Normal postoperative appearance of the left lung . No pneumothorax .