Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a stent graft in the left cephalic arch , described on the recent fistulogram . Compared with the prior radiograph , pulmonary edema is severe and persistent . Increasing right lower lobe opacification may be in part positional , however a suspected right pleural effusion with overlying atelectasis has worsened . Superimposed infection is not excluded in this region . There is no evidence of pneumothorax . Left pleural effusion is trace , if any . No change in the cardiomediastinal silhouette .
    OUTPUT:
    
1 . Severe persistent pulmonary edema . 2 . Increasing right lower lobe opacification is likely due to increasing right pleural effusion with adjacent atelectasis . However , superimposed infection is not excluded on the basis of chest radiograph . 3 . Interval placement of a stent graft in the region of the left cephalic arch , described on the recent fistulogram .