Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low causing mild vascular crowding . There are no focal airspace opacities to suggest pneumonia . The heart is top normal . The cardiomediastinal silhouette and hilar contours are normal . There is no pneumothorax or large pleural effusion .
    OUTPUT:
    
Low lung volumes cause mild vascular crowding . Otherwise normal radiograph of the chest .