Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . The heart size appears top normal , and likely accentuated by the low lung volumes . Mediastinal and hilar contours are relatively unchanged with apparent widening of the superior mediastinum likely attributable to mediastinal fat as seen on the prior CT . There is crowding of the bronchovascular structures . Patchy airspace opacities in the lung bases may reflect atelectasis . Ill - defined 1 cm nodular opacity projecting over the right upper lung field appears new compared to the prior study , an and area of infection can not be completely excluded . There is no large pleural effusion or pneumothorax . Loss of the right acromial humeral interval is compatible with underlying rotator cuff disease . Moderate to severe degenerative changes of both glenohumeral acromioclavicular joints are re-demonstrated .
    OUTPUT:
    
Low lung volumes . Patchy bibasilar airspace opacities could reflect atelectasis but infection is not excluded . Ill - defined nodular opacity in the right upper lung field may also represent a site of infection but is nonspecific .