Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a left - sided chest tube and pigtail catheter . Compared to the prior film , the pigtail catheter may have retracted slightly . Also again seen is extensive subcutaneous emphysema over the over the left chest . Possibility of a small left apical pneumothorax would be difficult to exclude in this setting , though no obvious change is identified . There is minimal atelectasis at the left base , similar to prior . No gross left effusion . Again seen is relative lucency at the right lung base which could reflect bullous change . Platelike atelectasis in the right mid zone versus fluid in the minor fissure again noted . Trace blunting of the right costophrenic angle is unchanged . The cardiomediastinal silhouette is similar to the prior . There is upper zone redistribution , without overt CHF .
    OUTPUT:
    
Left pigtail catheter may have retracted slightly compared to the prior film . No gross left pneumothorax , though small left pneumothorax would be difficult to exclude due to extensive subcutaneous emphysema . Upper zone redistribution , without overt CHF . No new focal opacity . No gross effusion .