Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are unchanged with the heart size within normal limits . The pulmonary vascularity is not engorged . Again demonstrated are patchy ill - defined opacities in the left lung base and right middle lobe , not substantially changed from the prior study . No pleural effusion or pneumothorax is present . There are multilevel moderate degenerative changes in the thoracic spine .
    OUTPUT:
    
Unchanged left basilar and right middle lobe opacities concerning for pneumonia .