Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are essentially clear besides mild bibasilar atelectasis . There is no effusion or edema . Cardiomediastinal silhouette is within normal limits . There is tortuosity of the descending thoracic aorta and atherosclerotic calcifications at the arch . Compression deformities in the visualized upper lumbar spine are unchanged .
    OUTPUT:
    
No acute cardiopulmonary process .