Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear and well expanded bilaterally with no focal consolidations , lesions , or masses . There is no pleural effusion or evidence of pneumothorax . The aorta is slightly tortuous ; otherwise , the cardiomediastinal silhouette is within normal limits . Pleural surfaces are unremarkable . There are moderate degenerative changes seen along the thoracic spine .
    OUTPUT:
    
No evidence of infection or malignancy .