Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are unchanged , with slight unfolding of the thoracic aorta . The pulmonary vascularity is normal and the lungs are clear . Blunting of the posterior costophrenic sulcus on the right may suggest the presence of a trace right pleural effusion . There is no pneumothorax . Multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Blunted right posterior costophrenic angle likely indicative of a small pleural effusion . Otherwise no acute cardiopulmonary abnormality .