Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tenting of the right hemidiaphragm is postsurgical in nature . Unchanged right mediastinal surgical clips . Lungs are well - expanded , but there is a new left lower lobe opacity seen best on the PA film , concerning for pneumonia . No pneumothorax . The cardiomediastinal silhouette is stable .
    OUTPUT:
    
New left lower lobe opacity , seen best on the PA film , is concerning for pneumonia .