Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy . The appearance of the cardiac and mediastinal silhouettes is stable ; patient has reported history of known thoracic aortic dissection and descending aortic dilatation . There is a likely hiatal hernia . No focal consolidation is seen . No large pleural effusion or pneumothorax . No overt pulmonary edema .
    OUTPUT:
    
No acute cardiopulmonary process . Stable appearance of the mediastinum .