Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker with leads terminating in the right atrium and right ventricle is again noted , with leads in unchanged positions . The cardiac silhouette size is stable and top normal . The mediastinal and hilar contours are unremarkable . The lungs are clear . No pleural effusion or pneumothorax is seen . There are linear opacities in the lung bases compatible with subsegmental atelectasis . No pulmonary vascular congestion is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .