Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and pulmonary vasculature are unremarkable . There is no pleural effusion or pneumothorax . A vague opacity , not present on prior films of the chest , is seen in the right lower lobe .
    OUTPUT:
    
Possible vague opacity in the right lower lobe may , in the appropriate clinical context , represent pneumonia .