Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , accentuating the cardiac silhouette and bronchovascular structures . Allowing for this factor , heart is upper limits of normal in size . No confluent areas of consolidation are observed , and there are no pleural effusions .
    OUTPUT:
    
No definite pneumonia , but assessment of lung bases is limited by low lung volumes . Repeat radiograph with improved inspiratory level may be helpful in this regard if warranted clinically .