Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The mediastinal and hilar contours are unchanged . The pulmonary vasculature is not engorged . Patchy left lower lobe opacity is concerning for infection . No pleural effusion or pneumothorax is seen . There are mild multilevel degenerative changes noted in the thoracic spine .
    OUTPUT:
    
Patchy left lower lobe opacity concerning for infection .