Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate top normal size of cardiac silhouette . The mediastinal and hilar contours are unremarkable . The lungs are clear . There is no pneumothorax , vascular congestion , or pleural effusion . There is mild displacement of the trachea to the right , possibly due to a goiter or tortuous enlarged innominate artery .
    OUTPUT:
    
No evidence of pneumonia .