Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and pulmonary vasculature are unremarkable and unchanged since most recent examination . The lungs are clear aside from bibasilar atelectasis . Again noted is a small left apical pneumothorax . Minimal subcutaneous emphysema is noted . The stomach is distended .
    OUTPUT:
    
Persistent , small left apical pneumothorax .