Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate markedly hyperinflated lungs with increased AP diameter and flattening of the diaphragms indicating severe emphysema . The subtle opacity seen on the prior radiograph has improved . Remote healed right rib fracture is noted . The mediastinal and hilar contours are normal aside from mildly tortuous aorta . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Improved area of opacification at the right base . No other definite focal pneumonia .