Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is borderline in size . There is mild unfolding of the thoracic aorta . The lungs appear clear . There no pleural effusions or pneumothorax . Mild degenerative changes affect the mid through lower thoracic spine , and there is a minimal wedge compression deformity of a mid thoracic vertebral body that is likely chronic .
    OUTPUT:
    
No evidence of acute disease .