Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparison is made to ___ . The heart size is normal and unchanged . Mediastinal and hilar contours are stable . Linear opacities at the left lung base are also unchanged , likely representing scarring . No focal consolidation , pleural effusion or pneumothorax is present . Multilevel degenerative changes are again noted with stable compression , particularly approximately of the T11 vertebral body . Possible small hiatal hernia is present .
    OUTPUT:
    
No evidence of pneumonia or pulmonary edema .