Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is a developing opacity in the right medial lower lung , partly obscuring the right hemidiaphragm and perhaps involving both the right middle and lower lobes . Elsewhere , the lung fields remain clear . Bony structures appear normal .
    OUTPUT:
    
Developing right lower lung opacities worrisome for pneumonia .