Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Permanent pacemaker remains in place with one lead overlying the right ventricle and the second placed for biventricular pacing . Cardiac silhouette is enlarged and accompanied by upper zone vascular redistribution , but previously present interstitial edema has resolved . Opacity at right cardiophrenic angle is unchanged since older studies and corresponds to an enlarged right pericardial fat pad on prior CTA of the chest of ___ , with associated linear scar in the right middle lobe . However , on the lateral view , apparently new area of opacity overlies the lower thoracic spine , and is difficult to localize on the frontal radiograph .
    OUTPUT:
    
1 . Improved CHF with resolution of interstitial edema . 2 . Lower lobe opacity posteriorly on lateral view , which could represent a focal basilar pneumonia , atelectasis or aspiration . Followup chest x-ray may be helpful in this regard if warranted clinically .