Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA lnd lateral views of the chest . No prior . On the lateral view , there is a vague nodular opacity projecting over the aortic arch which may localize to the right upper lung . Elsewhere , the lungs are clear . Cardiomediastinal silhouette is normal . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
No definite acute cardiopulmonary process . Nodular opacity projecting over one of the upper lobes , presumably on the right for which chest CT is suggested to further characterize .