Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single lead pacemaker terminates in the right ventricle . The heart is mildly enlarged with a left ventricular configuration . The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . The lungs appear clear . Bony structures are unremarkable .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .