Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The mediastinal , pleural and pulmonary structures are unremarkable . The cardiac silhouette is unchanged and normal . There is no focal infiltrate to suggest pneumonia . No pleural effusion or pneumothorax is seen . There are degenerative changes of the thoracic spine marked by disc space narrowing and endplate sclerosis . AN IVC filter and abdominal clips are noted .
    OUTPUT:
    
No acute cardiopulmonary process .