Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided dual chamber pacemaker device is noted with leads terminating in unchanged positions in the right atrium and right ventricle . Moderate cardiomegaly is re - demonstrated . The mediastinal and hilar contours are unchanged . There is no pulmonary edema . Linear opacities within the left lung base likely reflects subsegmental atelectasis . Remainder the lungs are clear . No pleural effusion or pneumothorax is seen . No acute osseous abnormalities seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .