Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The pigtail catheter has been removed . Small left - sided apical pneumothorax measuring 10 mm in diameter . No pulmonary contusion seen . No pneumothorax . Heart size normal . The left clavicular and left ___ to 4th rib fractures are again visualized .
    OUTPUT:
    
Small apical pneumothorax measuring 10 mm in diameter .