Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear unchanged . There has been considerable improvement in opacity in the right middle lobe . A nodular density projecting over the left lateral upper lobe and perihilar opacities appear similar . Lungs appear hyperinflated . There are no pleural effusions or pneumothorax . Prior healed right lateral sixth through eighth rib fractures appear unchanged . There is mild rightward convex curvature centered along the lower thoracic spine .
    OUTPUT:
    
Marked improvement in right middle lobe opacity with persistent patchy opacities that can probably be attributed to chronic disease ; however subtle acute on chronic disease is difficult to entirely exclude .