My 9 year old son was hit by a car when he was 2. He was treated and monitored at our University Hospital and was released after a nights stay. He did have a head injury but we were told all was OK. We now believe he is showing signs of Tourettes. There is no Tourettes in our family. Could he have developed Tourettes 7 years later from the head injury? And if so, does it change anything as far as treatment or expected outcome?