Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation or pulmonary edema . No pleural effusion or pneumothorax . The heart size is normal . The mediastinal contours , hila , and pleura are unremarkable . Mildly tortuous descending aorta . Mild degenerative changes involving the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .