Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The main pulmonary artery contour is mildly prominent , but unchanged and probably compatible with a normal variant . Mild unfolding of thoracic aorta is also similar . There is minimal relative elevation of the right hemidiaphragm compared to the left . There is no pleural effusion or pneumothorax . Streaky opacity at the left lung base is compatible with minor atelectasis . There is no pleural effusion or pneumothorax . Small osteophytes are noted along the thoracic spine .
    OUTPUT:
    
No evidence of acute disease .