Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . Blunting of the posterior costophrenic angles is unchanged since ___ and may be chronic . There is no large effusion or pneumothorax . Pleural based scarring seen at the left lung apex . The cardiomediastinal silhouette is within normal limits . Descending thoracic aorta is noted . S shaped thoracolumbar scoliosis is again noted .
    OUTPUT:
    
No acute cardiopulmonary process .