Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lungs are hyperinflated and lucent compatible with known emphysema . No focal consolidation , large effusion or pneumothorax . No signs of edema or central vascular congestion . Bony structures appear intact though somewhat demineralized .
    OUTPUT:
    
Emphysema without superimposed acute process .