Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart appears to be normal in size and configuration . Trachea is midline . Cardiomediastinal contours are unremarkable . Lung fields are clear with no evidence of focal infiltrates . No pleural effusions or pneumothorax . Bony structures show some degenerative changes , but are otherwise unremarkable .
    OUTPUT:
    
Normal radiographic study of the chest .