Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are within normal limits . On the lateral view , there is increased retrocardiac opacification that is new compared to the prior study and could represent pneumonia in the appropriate clinical context . No pleural effusion or pneumothorax . Prominent anterior osteophytes are noted in the mid to lower thoracic spine .
    OUTPUT:
    
Interval development of airspace opacification in the retrocardiac region is consistent with pneumonia in the appropriate clinical context .