Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is again seen to be upper limits normal in size . The mediastinal and hilar contours are normal . There is no infiltrate . Postoperative changes are present within the thoracic spine related to the previous fusion procedure . There is a 6 mm nodular opacity projecting over the ___ posterior right rib that is more apparent on today 's study than prior . It is unclear if this is within the bone or within the lung and followup should be obtained with attention to this region . In addition there is increased opacity projecting over the anterior portion of the ___ left rib that is felt to be in bone .
    OUTPUT:
    
No focal infiltrate , but 2 areas of increased opacity projecting over bones that could represent sclerotic lesions .