Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size , mediastinal and hilar contours are normal . Lungs are grossly clear . Minimal blunting of left lateral costophrenic sulcus appears unchanged and probably reflects pleural thickening , although a small pleural effusion could produce a similar radiographic appearance .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Lateral left costophrenic angle blunting , which likely represents pleural thickening and less likely a small pleural effusion .