Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval development of a moderate size right pleural effusion . Right basilar opacity could reflect atelectasis or infection . Heart size is difficult to assess given the presence of the pleural effusion but is likely unchanged and within normal limits . The mediastinal and hilar contours are unchanged with tortuosity of the thoracic aorta again noted . Left lung is clear . There is no pneumothorax . Multilevel degenerative changes along with levoscoliosis of the thoracolumbar spine are re - demonstrated .
    OUTPUT:
    
Moderate sized right pleural effusion . Right basilar opacity could reflect atelectasis but infection can not be completely excluded .