Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are fully expanded and clear . There is no evidence of pulmonary edema . The cardiomediastinal and hilar contours are normal . There is calcification of the aortic knob . There is no pleural effusion or pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
No evidence of pulmonary edema . Normal chest radiograph .