Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . The lungs are well - expanded . Small focal opacity in the right lower lobe is new since the prior study . Pulmonary vasculature is within normal limits .
    OUTPUT:
    
Small focal opacity in the right lower lobe is new since the prior study and may represent pneumonia or aspiration in the correct clinical setting .