Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low with minimal bibasilar atelectasis . There are no areas of focal consolidation to suggest pneumonia . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is within normal limits . Deformity of the left anterior fourth rib suggests old rib fracture .
    OUTPUT:
    
No acute intrathoracic process .