Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear unchanged . There are patchy streaky opacities with volume loss in the lingula , not changed and accordingly most suggestive of atelectasis or scarring . There is no pleural effusion or pneumothorax . Mild spinal degenerative changes are similar .
    OUTPUT:
    
No evidence of acute disease .