Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal radiograph of the chest demonstrates normal heart size . The lungs are mildly hyperinflated , but otherwise clear . No pleural effusion or pneumothorax . No displaced rib fracture . Calcification of the aortic knob and ascending aorta . Unchanged leftward tracheal deviation , possible related to thyroid goiter .
    OUTPUT:
    
No evidence of pneumonia .