Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior film , there are increasing opacities in the right infrahilar / cardiophrenic region , likely correponding to changes in the lower lobe posteriorly on the lateral view . In the correct clinical setting , these may represent pneumonia . No frank consolidation is identified . Again seen is background hyperinfilation / COPD . The aorta is tortuous . Upper zone redistribution , witout other evidence of CHF . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Patchy opacity right lower lobe posteriorly , increased compared ___ . The differential includes atelectasis or , in the correct clinical setting , pneumonia .