Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect chest film ___ at 04 : 20 is submitted .
    OUTPUT:
    
Three right - sided chest tubes remain in place . There is persistent opacity in the right mid to lower lung with super areas of interspersed lucency more likely reflecting aerated lung rather than loculated pneumothorax . No obvious pneumothorax is seen . Left lung reveals residual linear opacities in the left costophrenic angle which could reflect scarring or subsegmental atelectasis but is otherwise clear . No pulmonary edema . Stable cardiac enlargement status post median sternotomy with valve replacement .