Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior exam there has been no significant interval change including postoperative changes at the left hilum . The right lung is clear . The cardiomediastinal silhouette is unchanged with a tortuous aorta . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process . Postsurgical changes at the left hilum .