Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . There is hyperlucency of the left lung in comparison to the right lung , which is likely artifactual and due to the mild thoracolumbar scoliosis . Lungs are clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No evidence of pneumonia or congestive heart failure .