Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is been interval placement of a left - sided chest tube with pigtail formed along the periphery of the left mid lung field . Previously noted large pneumothorax has slightly decreased in size with improved aeration of the atelectatic left lung . Previously noted mild rightward shift of mediastinal structures has nearly completely resolved . The right lung remains emphysematous and hyperinflated . No pleural effusion or new focal consolidation is demonstrated . Heart size is normal . No pulmonary edema is seen . Extensive subcutaneous emphysema is noted along the left lateral chest , new in the interval , related to chest tube placement .
    OUTPUT:
    
Interval placement of left - sided chest tube with mild interval decrease in size of the large pneumothorax and partial re-expansion of the left lung . Previously noted contralateral mediastinal shift has resolved .