Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior chest radiographs , there is new subtle opacification in the right lower lung , which correlates with increased opacification in the retrocardiac clear space on the lateral view . Given the clinical history , this is concerning for pneumonia . Cardiomediastinal and hilar silhouettes are normal . No evidence of pneumothorax .
    OUTPUT:
    
New subtle right lower lung opacification , correlating with increased opacification in the retrocardiac clear space on lateral view , concerning for pneumonia given the clinical history .