Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Previously seen right pleural effusion may be slightly decreased in size . The right lateral pleural thickening is unchanged . The left lung is clear . No evidence of pneumonia . Cardiac size is normal . No mediastinal widening . No pneumothorax .
    OUTPUT:
    
Persistent right pleural effusion , possibly slightly decreased in size , and unchanged right pleural thickening . No evidence of pneumonia . These findings were discussed with Dr . ___ at 10 :30 a .m . on ___ by telephone .