Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal upright radiograph of the chest . Lower lung volumes are noted . Mild enlargement of the cardiac silhouette is again noted , perhaps slightly smaller than on prior study . No focal consolidation , pleural effusion or pneumothorax is present . Vascularity is within normal limits .
    OUTPUT:
    
No evidence of pneumonia .