Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A pleural catheter has been placed , terminating in the left lung apex . There is a persistent moderate - sized pneumothorax ( which can be quantified as a distance between the superior lung edge and pleura of up to 2 .5 cm ) , but the lung has expanded considerably since the prior study and rightward shift of mediastinal structures has also resolved . There is no definite fluid component no this AP view . The patient is status post left lower lobectomy . The cardiac , mediastinal and hilar contours appear unchanged .
    OUTPUT:
    
Persistent moderate pneumothorax on the left status post chest tube placement , but with considerable improvement in aeration . Continued follow - up radiographs are recommended .