Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are normal . Obscuration of the right heart border would ordinarily suggest right middle lobe pneumonia , but there is no corresponding abnormality on the lateral view , and lungs are otherwise clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Because the abnormal appearance of the right middle lobe is seen only on the frontal view , if clinical findings warrant suspicion of early pneumonia , follow up chest radiographs should be obtained .