Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , resulting in crowding of bronchovascular structures at the bases . Given the low lung volumes , the cardiac silhouette and mediastinal structures are unremarkable . No definite focal consolidation is identified , though not entirely excluded given low lung volumes . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes . If there is persistent concern for pneumonia , repeat study with improved inspiratory level may be helpful for more complete assessment of the lung bases .