Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal and hilar contours are within normal limits . Lungs remain hyperexpanded . A previously present peripheral 2 .3 cm diameter opacity in the right upper lobe has decreased in size and radiographic density with residual ill - defined opacity remaining at the level of the fourth right anterior rib level . No definite new areas of lung opacification have developed , and there are no pleural effusions or acute skeletal findings .
    OUTPUT:
    
Resolving peripheral right upper lobe opacity , which is most likely due to slowly resolving infection or organizing pneumonia . Given the history of fever and the presence of multifocal abnormalities on ___ chest CT , followup chest CT may be helpful to assess for lung abnormalities below the resolution of conventional chest radiographs .