Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are compared to previous exam from ___ . Left - sided vagal nerve stimulator is seen with device overlying the left upper lung . Where seen , the lungs are clear . There is no effusion or infiltrate . Cardiomediastinal silhouette is normal . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .