Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One frontal view of the chest , upright . There is mild left basilar atelectasis . There is no pleural effusion or pneumothorax . Cardiac , mediastinal and hilar contours are normal . There are aortic knob calcifications . There is no free air . Again seen are dilated loops of small bowel in the abdomen .
    OUTPUT:
    
No free air . Mild left basilar atelectasis .