Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . A dual - lead pacer is unchanged with proximal and distal leads in the right atrium and right ventricle respectively . Lungs are clear . No pleural effusion or pneumothorax . Heart and mediastinal contours are normal . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process .