Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear , without focal consolidations to suggest pneumonia . There is no pleural effusion or pneumothorax . Heart size is normal . The mediastinal silhouette is unchanged from prior with an unfolded thoracic aorta . Mild degenerative changes marked by endplate sclerosis are noted within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .