Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright chest radiograph was provided . Midline sternotomy wires and left chest wall pacer device again noted with pacer lead extending into the region of the right atrium and right ventricle . Multiple mediastinal clips are noted . As seen on prior high res CT , areas of scarring evidenced by subtle linear reticular opacity at the right lung base present . The heart is mildly enlarged . There is no definite effusion , though the left CP angle is excluded . No pneumothorax . No signs of CHF or discrete signs of pneumonia . Bony structures are intact .
    OUTPUT:
    
Cardiomegaly with stable area of scarring at the right lung base .