Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle patchy lateral left base opacity is nonspecific , but infectious process versus scarring may be present . Some thickening is seen along the major fissure on the lateral view , much less likely trace fluid in the fissure . No pleural effusion is seen at the posterior costophrenic angles . No pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable . Evidence of DISH is seen along the spine .
    OUTPUT:
    
Subtle patchy lateral left base opacity is nonspecific , could represent infectious process / pneumonia versus scarring or atelectasis .