Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Cardiomediastinal and hilar contours are normal . Opacity in the left lung base is concerning for pneumonia , particularly given the clinical history . Scarring within the right upper lobe laterally is unchanged . No pleural effusions or pneumothorax .
    OUTPUT:
    
New left basilar opacity is concerning for pneumonia .