Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Stable post treatment changes , left mid lung opacity . Stable adjacent posterior rib fragmentation and calcification . Surgical clips in place . There is tiny right pleural effusion , which has improved . . There are emphysematous changes in the upper lungs . . There is stable atelectasis in the lingula , right middle lobe
    OUTPUT:
    
Trace right pleural effusion has decreased . Otherwise stable exam .