Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is mild interstitial edema . There is a left upper lobe nodular opacity projects over the first rib . There is no pleural effusion , and the heart size and mediastinal contours are normal .
    OUTPUT:
    
Mild interstitial edema . Left upper lobe nodular opacity projecting over the left first rib . A repeat chest radiograph follow treatment or CT can be obtained for further evaluation .