Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left side dual - chamber pacemaker with leads terminating in the right atrium and right ventricle is in unchanged position . The cardiac , mediastinal and hilar contours are normal . Except for linear scarring within the periphery of the right mid lung , the lungs are clear . No pleural effusion or pneumothorax is present . Pulmonary vascularity is normal . No acute osseous abnormality is seen .
    OUTPUT:
    
No acute cardiopulmonary process .