Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . There has been interval placement of a left pigtail catheter which overlies the mid left lung . Size of the left - sided pneumothorax has not significantly changed . Lungs are otherwise unremarkable . Cardiomediastinal silhouette remains within normal limits .
    OUTPUT:
    
Interval placement of left pigtail catheter . No change in size of left pneumothorax .