Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Distended mediastinal contours related to known ascending calcified aorta . The heart remains enlarged . Persistent opacity in the right lung base and retrocardiac region has not substantially changed since ___ may reflect atelectasis and / or scarring . Likely small left effusion . No pneumothorax . No overt pulmonary edema , mild pulmonary vascular congestion .
    OUTPUT:
    
Mild pulmonary vascular congestion . Chronic bibasilar opacities likely a combination of scarring and / or atelectasis .