Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right chest tube is in unchanged position . Extensive subcutaneous emphysema is unchanged from 4 hr ago but improved compared to ___ . Emphysema is severe . Lungs are hyperinflated . Small anterior basilar right pneumothorax is slightly smaller compared to 4 hr ago . Cardiomediastinal silhouette is normal size . Pleural scarring is noted at the right lung base .
    OUTPUT:
    
Small anterior basilar right pneumothorax is slightly smaller compared to 4 hr ago .