Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to radiograph obtained 3 hr prior , there is been interval placement of a left anterior pigtail catheter . Previously seen left pneumothorax is decreased in size though persistent . Low lung volumes as well as bibasilar streaky opacities are again identified , likely reflective of atelectasis . Cardiomediastinal and hilar contours are unchanged in appearance . There is no pleural effusion .
    OUTPUT:
    
Interval placement of left anterior pigtail catheter . Prior seen left pneumothorax persistent though decreased in size . No pleural effusion .