Hello dear I understand your concern Enlarge duodenum could be due to the duodenitis,any lesion in the duodenum like polyp, any growth and obstruction. I would suggest to consult the Gastroenterologist and take proper traetment. Tablet Pantoprazole daily before breakfast Syrup mucaine before the meal Avoid eating junk and spicy foods. And maintain a regular feeding habit. Take light food like banana, rice, applesauce, yogurt, buttermilk, curd Other treatment will depend on the specific cause. Hope this may help you Best regards Dr. Sagar