winnie, scans are different tools than an EEG in that they record different data. I didn't know this until my daughter had one done. I've had a few concussions myself, one bad enough to keep me in the hospital for a week, but an EEG was never done. After my daughter's last hospitalization, I learned it isn't standard procedure. They did a whole body CT scan and saw no brain hemorrhaging and that's all they were looking for. Mild concussions don't bleed like that but they can do a world of damage. A fall from a high chair can cause a mild concussion.
If you already know this stuff, then let this post be for the rest of the board. I was just griping yesterday about Vet hospitals not using EEG's as a standard diagnostic. They keep throwing drugs at patients when it may not be appropriate treatment.