Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , suggesting the likelihood that streaky left basilar opacities constitute minor atelectasis . Elsewhere , the lungs appear clear . There are no pleural effusions or pneumothorax . The heart is at the upper limits of normal size . There is slight unfolding of the thoracic aorta . Otherwise , the mediastinal and hilar contours are unremarkable . The osseous structures show minimal degenerative change .
    OUTPUT:
    
No evidence of acute disease .