Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear . The cardiac silhouette is borderline enlarged . Mediastinal and hilar contours , and pleural surfaces are normal . No pneumothorax , pulmonary edema , pleural effusion , or pneumonia . There are mild degenerative changes in the visualized spine .
    OUTPUT:
    
No acute cardiopulmonary process