Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest , PA and lateral radiographs demonstrate tortuous or generally widened though not focally aneurysmal aorta . Otherwise , mediastinal and hilar contours are unremarkable . Heart size is normal . Lungs are clear . No pleural effusion or pneumothorax evident .
    OUTPUT:
    
No acute intrathoracic process .