Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright frontal and lateral chest radiographs demonstrate hyperinflated lungs , without focal consolidation , pleural effusion or pneumothorax . The cardiac silhouette remains normal in size , the mediastinal contours are notable only for tortuosity of the thoracic aorta .
    OUTPUT:
    
No acute chest abnormality , with unchanged findings of COPD .