KG - I think you misread what you highlighted. Of all the times that I have gone to the doctor for head injuries (I would say approximately 7 times) they have only once performed a CT scan and MRI. That would be the time that I was having crippling migraines at age 12 from getting my head slammed into a concrete wall; no one believed that I actually was hurt and it took me six months to convince my mom to take me from a doctor. They discovered old serious head trauma and said I most likely had had a severe concussion. They said there was nothing that could have been done had I come in immediately and nothing that could be done then.

Of all my head injuries I have only been knocked out once and was still not CT'ed or MRI'ed. When I hit my head now I always let someone know, but don't always go to the doctor, as you said every head injury is different.