Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The trachea slightly deviated towards the left , of unclear clinical significance . Lung volumes are normal . Lungs are free of consolidation , effusion or pneumothorax . Cardiomediastinal contours are normal . There is no subdiaphragmatic free air .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Minimal leftward tracheal deviation , of unclear clinical significance . Recommend clinical inspection for possible thyroid enlargement .