Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patchy right middle lobe opacity is worrisome for pneumonia . No pleural effusion or pneumothorax is seen . The heart is top - normal in size . No pulmonary edema is seen .
    OUTPUT:
    
Patchy right middle lobe opacity raises concern for pneumonia . Atelectasis what also be in the differential diagnosis .