Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A vagal nerve stimulator partially obscures the left mid chest but is unchanged in position . Heart size is normal . The mediastinal and hilar contours are normal , and there is no change in the appearence of mediastinal calcified lymph nodes . The pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . Chronic deformity of the right clavicle is similar in appearance to the prior exam .
    OUTPUT:
    
No acute cardiopulmonary abnormality .