Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is top - normal in size . The mediastinal contour is unremarkable . Lungs are clear . Scattered small round lucencies most notable at the right base may represent dilated airways or bronchiectasis . There is no pleural effusion or pneumothorax . Degenerative changes in the thoracic spine are noted .
    OUTPUT:
    
No evidence of pneumonia .