Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided demonstrate vague reticular opacity at the left lung base , which could represent atelectasis or scarring , though the possibility of a very early pneumonia can not be entirely excluded . The right lung is grossly clear . Heart size is difficult to assess , but appears within normal limits in size . Mediastinal contour is normal . No pneumothorax or pleural effusion is seen . Bony structures are intact .
    OUTPUT:
    
Vague linear opacity at the left lung base , partially obscuring left heart border , could represent scarring / atelectasis , though pneumonia can not be excluded . Please correlate clinically .