Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Lungs are clear and hyperinflated compatible with known emphysema . There is no superimposed pneumonia , edema , effusion or pneumothorax . Cardiomediastinal silhouette appears within normal limits . No acute osseous abnormality .
    OUTPUT:
    
Emphysema without superimposed pneumonia .