Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided PICC terminates in the mid SVC . A fiducial marker is seen in the left mid lung with adjacent masslike opacity . This has improved when compared to the prior chest radiographs . Slight interval improvement in aeration of the right lung base . The left pigtail catheter is no longer visualized . No pneumothorax seen . Trace pleural effusion on the left .
    OUTPUT:
    
Slight interval improvement in the aeration of the right lung base . No pneumothorax seen .