Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The mediastinal and hilar contours appear within normal limits . Aside from streaky left basilar opacities most suggestive of minor atelectasis , the lungs appear clear . There are no pleural effusions or pneumothorax . Slight degenerative changes are noted along the lower thoracic spine .
    OUTPUT:
    
No evidence of acute disease .