Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . The heart is normal in size . Previously , the left hemidiaphragm was somewhat elevated , but this has resolved . Although volume loss has resolved , a lateral view now depicts a posterior basilar opacity , probably in the left lower lobe , concerning for pneumonia . There is no pleural effusion or pneumothorax . Lumbar spinal fusion hardware is only partly visualized and not well assessed .
    OUTPUT:
    
Left lower lobe opacity concerning for pneumonia .