Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is top - normal in size . The aorta is tortuous and shows some mural calcification . The lung volumes are somewhat low which accentuates bronchovascular markings . Given that , there is increased opacity involving the right lower lobe which could represent atelectasis or infection in the appropriate clinical setting . The left lung appears clear . There is no pulmonary edema , pleural effusion or pneumothorax .
    OUTPUT:
    
Right lower lobe opacity could represent atelectasis or infection in the appropriate setting .