Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , effusion , or edema . The cardiomediastinal silhouette is stable . Atherosclerotic calcifications noted at the aortic arch . No acute osseous abnormality . Posterior left third and fourth rib fractures are chronic .
    OUTPUT:
    
No acute cardiopulmonary process .