Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show clear lungs without focal consolidation , pleural effusion , or pneumothorax . The pulmonary vasculature is not engorged . The cardiac silhouette is normal in size . The mediastinal and hilar contours are within normal limits and unchanged from the ___ radiograph . The thoracic aorta is unfolded with mild tortuosity of the descending thoracic aorta . The aortic knob is minimally calcified . Degenerative changes are noted in the thoracic spine on the lateral radiograph .
    OUTPUT:
    
No acute cardiopulmonary process .