Both testicles? My middle son had an undescended testicle removed at age 2. The other one had descended. That was 6 years ago now, so I can't remember much. I thought, however, that they located it first using an ultrasound - before the surgery. I could be wrong, though, and confusing myself with something else. It was in his mid-belly area on his left side. They made a small (max 1") incision in his left upper groin area and used a camera to locate it and found that it was no longer viable so they removed it. If they found it was viable then they would have tried to bring it down.
hth I hope it all goes ok. btw, the weirdest part was taht when he was done, the surgeon told me that he has until he turns 12 or so to decide if he'd like a prosthetic testicle put in place and it would be covered by our healthcare system. I laughed and he said that only about 1/10 choose this and it's usually kids who grew up with 2 but had to have one or both removed and so they feel like something is missing.
Hi casey lea and welcome to Mothering! I;m so sorry yur little one is having such issues. I do hope all goes well and you find a doctor whom you feel comfortable with.
I'm going to move your thread over to our Child Health forum where it will get better input.
All the best to you and your little guy.