Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right PICC is faintly visualized however tip is not clearly delineated on today 's exam . Left chest wall pacing device is again noted . Mild pulmonary edema is again noted . New retrocardiac opacity silhouetting the hemidiaphragm may be any combination of effusion consolidation or atelectasis . Right basilar opacity is likely atelectasis given change between the 2 films . Posterior right rib fracture is old . Anterior approach cervical fixation hardware is seen as well as chronic right distal clavicular fracture .
    OUTPUT:
    
Mild pulmonary edema with new retrocardiac opacity , likely some combination of effusion and atelectasis with possible infection .