Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated and clear bilaterally with no masses , lesions , pleural effusion or pneumothorax identified . The cardiomediastinal silhouette is stable and within normal limits . The pleural surfaces are unremarkable . There are mild stable degenerative changes seen within the thoracic spine .
    OUTPUT:
    
No evidence of malignancy or infection .