Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a single - lead pacemaker device terminating in the right ventricle . The cardiac , mediastinal and hilar contours appear unchanged . The lungs appear clear . There is no pleural effusion or pneumothorax . There is no definite bony abnormality . A pacemaker partly obscures the course of the lateral and anterior left third rib and this study does not constitute a complete rib series .
    OUTPUT:
    
No evidence of injury .