Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Hyperexpansion of the lungs is exaggerated by a pectus deformity of the sternum and elongated vertical diameter of the chest . There is no pleural effusion or pneumothorax . The cardiac silhouette is normal in size , the mediastinal contours are normal .
    OUTPUT:
    
Possible emphysema or small airways obstruction . No pneumonia .