Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal , and hilar contours appear unchanged . The lung volumes are low . There is a patchy left basilar opacity obscuring the cardiac border and apex of the left hemidiaphragm , worrisome for pneumonia . Elsewhere , the lungs appear clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
New left basilar opacity worrisome for pneumonia .