Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild pulmonary edema is increased since the prior study . Dilatation of the bilateral pulmonary arteries is compatible with pulmonary arterial hypertension . Cardiac silhouette is moderately enlarged . No focal consolidation , pleural effusion , or pneumothorax is seen . A left chest pacemaker and leads are in unchanged positions . Tricuspid and mitral valves replacements are again seen .
    OUTPUT:
    
Mild pulmonary edema and enlargement of the pulmonary arteries .