Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Subtle opacity in the right lower lobe is concerning for infection . No pleural effusion or pneumothorax is seen . A ventriculoperitoneal shunt is partially imaged and appears grossly intact .
    OUTPUT:
    
Right lower lobe pneumonia .