Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left pigtail catheter is unchanged in position . The lung volumes are low . A left apical pneumothorax is again seen , which is essentially unchanged in size . There is no evidence of pneumonia . There is a small right effusion . The cardiomediastinal silhouette and hilar contours are normal .
    OUTPUT:
    
1 . Left pigtail catheter , largely unchanged in position . 2 . Left apical pneumothorax unchanged in appearance .