Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to prior , there is mild left mid lung atelectasis . Otherwise , the lungs are well expanded and clear . The heart size is unchanged . Mediastinal and hilar contours are unchanged . Left - sided dual - chamber pacemaker appear unchanged with the leads in right atrium and right ventricle . Right port terminates in low SVC , unchanged from prior . No pleural abnormality is seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Left sided dual - chamber pacemaker unchanged in position .