Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperinflated , with biapical scarring and relative flattening of the bilateral hemidiaphragms . There is no pneumothorax , pleural effusion , or overt pulmonary edema . The cardiomediastinal silhouette is unremarkable . There is no subdiaphragmatic free air . There is mild narrowing of the trachea at the level of the aortic arch , not significantly changed compared to prior studies .
    OUTPUT:
    
1 . No subdiaphragmatic free air or acute cardiopulmonary pathology . 2 . Emphysema and biapical scarring , likely from prior infection .