Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable including mild cardiomegaly . The aorta is again mild - to - moderately tortuous . There is no pleural effusion or pneumothorax . A dense opacity in the posterior lower lobes on the lateral view is probably in the right lower lobe , suggesting pneumonia .
    OUTPUT:
    
Dense opacity in the posterior right lower lobe suggesting pneumonia .