Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette including known thrombosed pseudoaneurysm arising from the aortic arch is grossly unchanged compared to prior examination . Lungs are clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . No acute intrathoracic process . 2 . Stable widening of the mediastinum related to known aortic arch pseudoaneurysm .