The CDC has just issued draft guidelines for treating concussions in children. Their first conclusion is that we should call them "mild traumatic brain injuries", mTBI, because too many people blow off a "concussion" as no big deal and they want people to take them seriously.
On the other hand they do not want people to take them too seriously. One of their recommendations is that most children should not receive CT scans, because that is so scary that the psychological danger is greater than the chance that something of medical importance will be learned. They dismiss MRIs altogether as not useful, and say the radiation damage from x-rays is also worse than any potential gain. Instead physicians should work from the usual template for assessing neurological trauma, examining pupil contraction, asking questions, observing neuromotor problems, and only if that examination suggests severe damage should more tests be ordered.
They also recommend against leaving children for too long in a darkened room. While the basic treatment for mild head injuries is "rest," and they advise a gradual return to a full schedule of activity, too much rest, especially in isolation, makes children anxious and depressed.
I don't really know anything about this type of medicine, but I am very glad to see the experts taking seriously the potential harm of treating children like something terrible has happened to them.