Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right pleural effusion has apparently decreased in size with only a small amount of fluid remaining , predominantly within the fissures . However , based on the configuration of the right hemidiaphragm , there may be a subpulmonic component of the effusion resulting in lateral peaking of the right hemidiaphragm . On the left , could be a small amount of fluid posteriorly in the posterior costophrenic sulcus . Cardiomediastinal contours are stable in appearance with persistent tortuosity of the thoracic aorta . Lungs are clear except for minimal linear atelectasis in the left mid and lower lung regions . Marked degenerative changes are present at both shoulders .
    OUTPUT:
    
Slight decrease in small right pleural effusion . Configuration of right hemidiaphragm suggests there may be potentially more substantial pleural fluid present with a subpulmonic distribution . A right lateral decubitus radiograph could confirm or exclude this possibility if warranted clinically .