Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The study is essentially unchanged from prior . A radiopacity in right apical region projecting over the second rib is essentially the same . Pleural thickening seen in the right apical region is also stable . There are no new lesions , masses , or areas of focal consolidation . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is stable and within normal limits . There is mild calcification of the aorta . Stable degenerative changes of thoracic spine .
    OUTPUT:
    
Study is essentially unchanged from prior .