Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacity at the left lung base peripherally is worrisome for infectious process . Question nodular opacity in the right lower lung zone medially , possibly superimposed shadows . Previous right middle lobe opacity seen on radiograph dated ___ has resolved . There are small bilateral pleural effusions . Upper lung zones appear clear . Cardiomediastinal and hilar contours are stable . There is no pneumothorax . There is no air under the right hemidiaphragm .
    OUTPUT:
    
Left lower lung base opacity is worrisome for early infectious process . Nodular opacity projecting over the right middle lobe likely reflects superimposed vascular structures . Previous right middle lobe pneumonia has resolved . Bilateral pleural effusions are small .