Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Stable , top - normal sized heart . Mediastinal and hilar contours are normal . There is chronic , unchanged , mild pleural and parenchymal scarring at the left base with a left juxtaphrenic peak . Pulmonary vasculature is normal . There is no pneumothorax . There is no pneumonia .
    OUTPUT:
    
No evidence of pneumonia .