Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . A subtle opacity is present localizing to the right middle lobe such that a pneumonia can not be excluded . No pulmonary edema , pneumothorax or significant pleural effusion is seen . The heart size is accentuated by low lung volumes .
    OUTPUT:
    
Questionable focal right middle lobe pneumonia . Follow up radiographs may be helpful if warranted clinically .