Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , which accentuates pulmonary vascular markings . No consolidation , effusion or pneumothorax is identified . Heart and mediastinal contour are normal . Posterior lower thoracic upper lumbar fusion rods and vertebral body screws are intact .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary process .