Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker leads terminate in the right atrium and right ventricle . There is moderate enlargement of cardiac silhouette . The aorta is tortuous and diffusely calcified . Mild pulmonary edema is present . No large pleural effusion or pneumothorax is identified . Probable retrocardiac atelectasis is noted . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild congestive heart failure .