Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are lower in comparison to the prior examination from ___ at 8 : 53 . Again seen is a large right middle and upper zone gas / fluid collection and a subpleural loculated collection or lesion along the right lateral superior hemithorax , minimally changed since the 8 : 53 examination . Mild superimposed pulmonary edema appears stable . The hilar mediastinal contours are unchanged . There has been interval removal of an epidural catheter . The right IJ catheter again terminates at the mid to upper SVC .
    OUTPUT:
    
1 . Large gas / fluid collections within the right mid to upper zone appear stable since the ___ examinations . 2 . Unchanged background mild pulmonary edema .