Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is unchanged . Mediastinal contour is stable . There is no pleural effusion or pneumothorax . The thoracic aorta is mildly tortuous . There is no focal lung consolidation . Partially imaged posterior spinal fusion hardware in the upper lumbar spine .
    OUTPUT:
    
No radiographic evidence of pneumonia .