Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior study on ___ , there has been no significant change . The tip of the ET tube is located approximately 6 cm from the carina . Again seen is a left retrocardiac opacity , likely lower lobe volume loss and pleural effusion . However , superimposed pneumonia is considered in the appropriate clinical setting . There is elevation of the right hemidiaphragmatic contour or with mild atelectatic changes and a probable small effusion .
    OUTPUT:
    
1 . ET tube is located approximately 6 cm above the carina . Otherwise , no significant change since the prior radiograph on ___ .