Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiograph demonstrates nodular opacities within the right lung base . While these may reflect vessels on end , infectious process is difficult to exclude . There is no pleural effusion or pneumothorax . Lungs are slightly hyperexpanded . No air under the right hemidiaphragm .
    OUTPUT:
    
Nodular opacities within the right lung may reflect vessels on end although infectious etiology is difficult to exclude .