Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy . Multiple mediastinal surgical clips are compatible with prior CABG surgery . A prosthetic cardiac valve is also redemonstrated . The cardiac silhouette is top normal in size , but stable . The mediastinal and hilar contours are within normal limits . As seen previously , there is an area of scarring and loculated effusion obscuring the right lung base , which is stable over multiple prior studies . The left lung is clear . There is no pneumothorax .
    OUTPUT:
    
Stable scarring and loculated pleural effusion at the right lung base .