Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval placement of a left pigtail thoracostomy drain with tip in the left apex . Persistent , though decreased , left apical pneumothorax . Right chest port and left subclavian line are unchanged . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Bibasilar atelectasis . Lungs are otherwise clear . No pleural effusion is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Interval placement of a left apical pigtail thoracostomy drain . Persistent , though decreased , left apical pneumothorax .