Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well expanded . Diagonally oriented linear opacity projecting over the right upper - to - mid thorax , compatible with an unchanged area of scarring or rounded atelectasis as described on prior CTs . No other focal consolidation , effusion or pneumothorax is seen . The heart is normal in size and normal cardiomediastinal contours . Bilateral AC joint degenerative changes noted .
    OUTPUT:
    
Unchanged obliquely oriented opacity in the right hemithorax without evidence of acute process .