What do you tell people?

I teach 6th grade and I had to let my kids know that I would be gone for 6 weeks but at the same time I didn't want to go into too much detail about what I was going to be gone for. I told them I was having surgery and that I would be fine after I got back. Quite a few of them asked what kind of surgery. These are pre-teen kids who are just starting to realize that they have the equipment that I am going to be losing! And I knew I didn't want a parent phone call complaining that I had shared too much information! So I just told them I was going to have abdominal surgery and I figured when they went home with that information many of the mothers would figure it out. One of my students said he knew I wasn't getting gastric by-pass like his aunt did because I was way too skinny for that. They can be so sweet!