Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Previously seen bibasilar opacities have significantly improved from the prior study , however there is a subtle opacity in the right middle lobe . The upper lung zones are clear . There is no pneumothorax or pleural effusion seen . There are no acute osseous abnormalities . Previously seen at hilar adenopathy is less apparent on this study .
    OUTPUT:
    
Significantly improved bibasilar opacities with residual opacity in the right middle lobe , which could represent atelectasis or possibly a new focus of pneumonia .