Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate no focal opacity . Cardiomediastinal contours are within normal limits and stable when compared to prior examination dated ___ . There is no pleural effusion or pneumothorax identified . No evidence of pulmonary edema . Osseous structures are without an acute abnormality .
    OUTPUT:
    
No evidence of infectious process .