Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One portable AP view of the chest . There are low lung volumes compared to most recent study . Overall appearance is unchanged . The left chest tube is in same position . Tubes and lines are in unchanged position . Left upper and lower lobe opacities are unchanged . No pleural effusion or pneumothorax . Extensive subcutaneous emphysema unchanged .
    OUTPUT:
    
No significant change compared to study done earlier today .