Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is within upper limits of normal and the mediastinal and hilar contours are unremarkable . Again seen is a subtle area of opacification previously reported in the periphery of the right upper lobe . No other focal opacities are seen . The lungs are hyperexpanded and otherwise clear . There is no evidence of pneumothorax or pleural effusions . The heart size is normal .
    OUTPUT:
    
Focal peripheral right upper lobe opacity appears stable compared to the prior exam . As suggested on the previous study , evaluation with a chest CT may be helpful to definitively exclude the possibility of a slowly growing malignancy at this site .