Hello, I am new to this forum. While investigating the very same question you have asked, this thread jumped out at me.
I was a very young, naive mom when my son, at age 18mos, fell very hard and hit his forehead on the cement. He didn't lose consciousness, but after the initial trauma he fell several more times over the course of several months re-injuring the forehead in the same spot, I believe because his reflexes appeared to be diminished for some time following the initial injury. His pediatrician recommended nothing, accept putting a helmet on him. No suggestion of concussion. No follow up. He eventually stopped falling, but developed a calcium deposit on his forehead which remained for about 7 years.
He is now 19 years old. He is a big teddy-bear with a big heart. But he also suffers terrible mood swings which appear out of the blue and has a very difficult time controlling his anger and frustration. He has very little impulse control, and has difficulty with filtering. He was coded throughout his school years as learning disabled due to very poor processing skills. He was not ADHD.
I suspect, and it has been suggested, that he may have developed lesions in the frontal lobe and possibly a similar calcium deposit may still remain on the inside of his skull, opposite the outside one, which could be applying pressure on the brain.
It has now affected him in his adult life to the point where I feel he should be tested and receive guidance specific to his injury. He was fired from his first job, and consequently arrested for an outburst a work. His former employer testified that his "impulsive behavior" was very out of character for him. He understands at this point that he may need to seek treatment in order to lead a normal life.
Now, 18 years later, and with more advanced research, we are finally making the connection between his childhood brain injury and his unwarranted behaviors.
Monitor your childs injury for lasting effects. As I said, I was young and naive, and didnt get the guidance and support I should have from his Doctor. Insist upon more testing and treatment if you feel it is needed. And be sure the injury and list of symptoms is on the childs medical record, and is noted at any and all future appointments so ALL physicians are aware of its possible connection to any illnesses or behaviors!! I cannot emphasize that enough!
Good Luck!!!

I have a 35 year old family member that that received a blow to the forehead by a see saw at the age of 3. He received a number of stitches to his head and no further treatment. Growing up he was labeled as a poor student and trouble maker. Fast forward 30+ years- he has chronic anxiety and panic attack episodes. Applying, interviewing, or even looking at want ads seems to be an impossible task, much to the frustration of his wife. With much coaching and support he has secured part time retail employment only to seemingly self-sabotage or quit. He exhibits impulsive behavior and has recently developed a gambling addiction which causes further financial stress on his wife of 10 + years. He doesn't seem to understand or care of the stress his love ones deal with. Often saying he's the victim because his wife want him to work and he thinks he should continue to go to school and work towards his "phd". He's been in school full time for over 8 years now and still has yet to pass and accumulate enough credits to even be considered a sophomore. With all this going on, they decided to go to counseling. While assessing his behavior and point of view; the counselor could not help but noticed the pronounced scarring on his forehead. It has been determined that a majority of his behavior exhibited over all these years is directly related to the frontal lobe injury from his accident at the age of 3. His wife, child, and family love him and will continue to support him, but we're not sure what to do now.

Thank you for posting this. I am so sorry for what happened to your son. It is heartbreaking to think how much this one incident changed his life, and how different things could have been for him. I guess one good thing about all the new research -- especially the research targeting soldiers with TBIs -- is that maybe there will be new and better treatments for people like your son.

And thank you for the advice. It seems like, until recently, doctors didn't provide any useful information to people after concussions or even consider the possibility of doing follow-up. (Even now, it's not easy to get the right information and find the right help.) I really don't understand why this is, considering how common this type of injury is.