Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are again low with right basal atelectasis , which potentially might represent pneumonia . The right heart border is obscured , new since prior . There is no effusion or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen . VP shunt is partially imaged .
    OUTPUT:
    
Right middle lobe pneumonia .