Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is re-demonstration of mild cardiomegaly and tortuous thoracic aorta . Hilar contours are unremarkable . There has been interval placement of a left anterior chest wall pacemaker with dual - chamber leads terminating in appropriate position in the right atrium and right ventricle . There has been no mediastinal widening and there is no pneumothorax . The lungs are clear . There is no pleural effusion . Mild compression deformities of the T11 and T12 vertebral bodies are unchanged since a CT chest examination in ___ .
    OUTPUT:
    
Appropriate position of dual - chamber pacemaker leads without evidence of pneumothorax or mediastinal widening .