Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . Within the limitations , the lungs are clear without consolidation or edema . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal . Degenerative changes in the thoracic spine are similar to the prior exam .
    OUTPUT:
    
No acute cardiopulmonary process .