Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: It is difficult to visualize the pneumothorax on this morning 's film . Metastatic disease is unchanged . There is volume loss most marked at the left base . Left pigtail catheter , pacemaker , sternal wires and mediastinal clips are unchanged .
    OUTPUT:
    
Very small if any pneumothorax . Very difficult to visualize on today 's study