Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well - expanded and clear . No focal consolidation , effusion , edema , or pneumothorax . The heart is normal in size . The mediastinum is not widened . The descending thoracic aorta is slightly tortuous . Aortic knob calcifications are moderate . No acute osseous abnormality . Multilevel degenerative changes of thoracic spine including prominent anterior osteophytes are moderate .
    OUTPUT:
    
1 . Lungs are clear . 2 . Normal sized heart .