Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the most recent examination , there is extensive , stable subcutaneous emphysema in the right chest wall . Again noted is a small right apical pneumothorax . Persistent atelectasis is noted at the lung bases . A probable small right pleural effusion is again noted .
    OUTPUT:
    
Overall stable examination from 4 hours prior .