Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a left anterior chest wall pacer with dual - chamber leads leading to the expected location of the right atrium and right ventricle . The cardiomediastinal silhouette and hilar contours are stable . There is no pneumothorax . Lungs are clear . There is no pleural effusion .
    OUTPUT:
    
Appropriate positioning of left anterior chest wall dual - lead pacer .