Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP semi-upright chest radiograph ___ at 06 : 15 is submitted .
    OUTPUT:
    
Extensive bilateral subcutaneous emphysema limits evaluation of the lung parenchyma . Bilateral chest tubes remain in place . Overall , the appearance of the chest is not significantly changed . Cardiac and mediastinal contours are also stable . No evidence of pulmonary edema . No obvious pneumothorax , although on recent chest CT of ___ , small bilateral pneumothoraces were present .