Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate the lungs are well - expanded and clear . The cardiomediastinal silhouette is unremarkable . There is no evidence of pleural effusion , pneumothorax or pulmonary edema . A spinal stimulator is seen within the spinal canal at the level of the thoracic spine , unchanged since ___ .
    OUTPUT:
    
No acute cardiopulmonary process .