Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . More extensive opacity than before in the right lower lung , seemingly obscuring the right cardiac border to some extent , suggests middle lobe opacity . Elsewhere , the lungs remain clear , however .
    OUTPUT:
    
Right middle lobe opacity suggesting pneumonia .