Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs demonstrate hyperinflated lungs with diaphragmatic flattening and paucity of vessels in the bilateral upper lobes consistent with patient 's known emphysema . When compared to prior film dated ___ , there has been resolution of bilateral lower lobe opacification . There is a small left pleural effusion . There is no pneumothorax . Cardiomediastinal and hilar contours are unremarkable .
    OUTPUT:
    
Resolution of bilateral lower lobe opacities compared to prior radiograph dated ___ . Small left pleural effusion .