Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable chest radiograph demonstrates stable enlargement of the cardiac silhouette . Mediastinal and hilar contours are unremarkable . Faint opacification noted in the right lower lung may reflect resolving infectious process identified on the ___ radiograph , though can not exclude developing pneumonia . Interval resolution of left lower lobe pneumonia . No pleural effusion identified on the left . The right lower hemithorax is excluded from view . No pneumothorax evident . Stable positioning of the left pacemaker with leads terminating in the right atrium and right ventricle .
    OUTPUT:
    
Stable cardiomegaly . Right lower lung opacification may reflect resolving process identified ___ , though can not exclude new infectious process .