Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear of consolidation , pleural effusion or pneumothorax . No pulmonary edema . Cardiomediastinal contours are normal . No subdiaphragmatic free air . A radiodense structure projecting over the right mainstem bronchus is external to the patient , better demonstrated on the lateral view .
    OUTPUT:
    
Normal chest radiograph .