Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Allowing for changes due to this , the cardiomediastinal silhouettes are within normal limits . The bilateral hila are unremarkable . The lungs are clear . There is no evidence of pulmonary vascular congestion . There is no pneumothorax or pleural effusion . Moderate thoracic spine degenerative change is stable in appearance . Old bilateral rib fractures are again noted . Two relatively linear metallic structures posterior to the heart on the lateral view or unchanged from prior .
    OUTPUT:
    
No acute cardiopulmonary process . Low lung volumes .