Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Left atrioventricular pacemaker is unchanged . Lungs are well inflated and grossly clear . No pleural effusion or pneumothorax . The aorta is mildly tortuous , otherwise the hilar and cardiomediastinal contours are normal .
    OUTPUT:
    
Normal chest radiograph .