Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged as before . The pulmonary vasculature is prominent . Lung volumes are low which accentuates bronchovascular markings . There is a subtle opacity at the base of the right lung which may reflect atelectasis or infection . There may be a small right pleural effusion . A right humeral deformity appears chronic .
    OUTPUT:
    
Right lower lobe opacity may represent a small effusion and atelectasis or infection .