Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left apicolateral hydropneumothorax is similar in appearance to the previous study . Although it appears small in size on the frontal view , it is more substantial on the lateral view in the retrosternal region and is best characterized as moderate in size . Postoperative alterations of the cardiomediastinal contours on the left are unchanged as well as left - sided volume loss consistent with prior left upper lobe resection . Improving atelectasis at the lung bases , and a decrease in small left pleural effusion , which is nearly resolved . Probable persistent small right pleural effusion .
    OUTPUT:
    
Persistent left hydropneumothorax .