Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged , unchanged . Mediastinal and hilar contours are stable , with a small hiatal hernia again seen . The pulmonary vasculature is normal . No focal consolidation , pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities . Multiple clips are seen within the neck compatible with prior thyroidectomy . Partially imaged is lumbar spinal fusion hardware .
    OUTPUT:
    
No radiographic evidence for pneumonia .