Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette and mediastinal contours are within normal limits . There is patchy opacity at the left lateral lung base , which was not seen on the scout image from the prior CT scan and is compatible with a new left lung base pneumonia . The lungs appear otherwise clear . No pleural effusion . No acute osseous abnormalities seen .
    OUTPUT:
    
New left lung base pneumonia .