Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mild to moderately enlarged . Widespread pleural plaques are noted with calcifications . There is a meniscoid appearance to each costophrenic sulcus , which may reflect pleural thickening or very small effusions . Projecting over the central left lung is patchy opacification . For the most part , this is suspected to represent a pleural plaque but a superimposed parenchymal opacity in the area is suggested on the lateral view without a mass - like appearance and may reflect atelectasis , scarring or even pneumonia .
    OUTPUT:
    
Left mid lung opacity , which can be largely explained as a pleural plaque but a parenchymal opacity in the vicinity is suspected but not well characterized , potentially atelectasis or scarring although pneumonia is not excluded .