Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouettes appear stable . The bilateral hila are within normal limits . Mild hyperinflation , best appreciated on lateral view , again suggests underlying COPD , though this is less apparent than on prior study . The lungs are clear without evidence of focal airspace abnormality . There is no evidence of pulmonary vascular congestion . There is no evidence of pneumothorax or effusion . There is mild levoscoliosis of the upper thoracic spine .
    OUTPUT:
    
Mild hyperinflation suggestive of underlying COPD without evidence of superimposed acute cardiopulmonary process . No significant change from prior exam .