Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided dialysis catheter is again seen , with the tip in the region of the cavoatrial junction . The cardiac silhouette appears enlarged , which is accentuated by the portable technique . There is increased retrocardiac opacity seen at the left base , which is likely related in large part to atelectasis . There is no definite pleural effusion or consolidation . No evidence of pneumothorax . Osseous structures appear grossly unremarkable , aside from degenerative changes at the glenohumeral joints .
    OUTPUT:
    
Retrocardiac opacity which may be related to atelectasis . No definite pulmonary edema .