Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The examination is limited by patient 's body habitus . Lung volumes are low but the lungs appear clear . The cardiac silhouette is exaggerated by the low lung volumes and is otherwise unremarkable . The mediastinal silhouette and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes . No evidence of pneumonia .