Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable frontal radiograph through the chest demonstrates low lung volumes . The chin overlies and obscures bilatearl apices . There is opacification of the right lung base which likely reflects a small pleural effusion with underlying atelectasis . Infection can not be excluded . This has a similar appearance since prior examination dated ___ . Incidental note is made of bilateral hilar calcified nodes , which may relate to prior granulomatous disease . The heart is enlarged , unchanged since prior examination . Redemonstration of CoreValve in unchanged position . Aortic arch calcifications again noted . Degenerative changes within osseous structures again identified .
    OUTPUT:
    
Right basilar opacity compatible with pleural effusion and likely atelectasis , although infection can not be excluded . Stable cardiomediastinal silhouette .