I don't know much about RSD in the trunk, but what I've read says it is definitely more common in the extremities. But it seems to have a lot of facets that no one knows about. The good news is that if your plastic surgeon is astute and it actually is RSD, then maybe they can treat it early and put it in remission. (I was going to a podiatrist who didn't recognize my RSD for a year, and now looks like maybe that will cause me to be in pain the rest of my life????) Anyway, can you get a second opinion from a pain management md or a neurologist who has experience with RSD? That might ease your mind.