That's so interesting. X-rays are so informative!! What made you think to look for a chip?
I thought it might be a chip before and asked about it, but I was assured the chance of that was slim, especially since he was sound. I've never had xrays taken, not even when we bought him. He flexed perfect and I knew I wanted him so it didn't matter. Same thing before we injected him, there wasn't a point to pay for xrays of a 15 year old horse that's seen hard work all his life- the joint wasn't going to look great and it wasn't going to change what we were going to do. We decided to check it out after a month of on and off swelling that we couldn't get managed. Get a look at what's going on inside before draining the fluid and injecting steroids. I'm glad the vet found it before it had a chance to do significant damage. It seems like he has a good prognosis.