Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior study there has been placement of a left pigtail catheter which projects over the left mid lung . The left - sided pneumothorax is decreased in size , now small . There is new left lower lobe atelectasis . There is no pleural effusion on either side . Cardiomediastinal silhouette is normal .
    OUTPUT:
    
Status post placement of the pigtail catheter which projects over the left lung , and decreased size of left pneumothorax , now small .