Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No prior studies are available for comparison . The lung volumes are low . Allowing for this , the heart size is likely normal . There is some crowding of the vasculature also , likely due to low inspiration . The lungs are clear . There are no pleural effusions .
    OUTPUT:
    
Low lung volumes limit evaluation somewhat ; however , there is no evidence of pneumonia .