There can be some evidence on MRI or CT scan of some degree of Increased ICP and it can manifest itself as hydrocephalus (where the pressure and increased CSF fluid sort of squishes the brain) or by other structures becoming constricted where CSF would normally flow freely but now as no outflow. Over time, it can again build up....but its not as common for it to continue to happen with a mTBI as opposed to a subarachnoid hemorrhage or other severe TBI. You sound like you are doing well and making great progress. Good luck with the return to work!