Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single AP radiograph of the chest was acquired . Severe enlargement of the cardiac silhouette is not significantly changed , allowing for differences in lung volume . There are bilateral perihilar - predominant reticular opacities as well as vascular cephalization and subtle Kerley B lines seen at the right lateral lung base , most consistent with mild interstitial pulmonary edema . Slightly more conspicious reticular opacities at the right lung base have been seen on several prior radiographs , including the study from ___ , likely representing scarring / atelectasis . There is no focal consolidation . No definite pleural effusion is seen . There is no pneumothorax . Vascular stents are seen within the left brachiocephalic vein , extending through the mid to lower SVC .
    OUTPUT:
    
1 . Mild interstitial pulmonary edema . 2 . Severe enlargement of the cardiac silhouette , not significantly changed .