Persons injured in accidents or automobile collisions may suffer dome type of head injury. Head injuries are classified as mild, moderate or severe. Mild head injuries can include headaches, dizziness, irritability and some confusion. Moderate or severe head injuries can include symptoms of substantial neurological and neuropsychological problems. If head injury is suspected, a CAT scan and/or MRI may be performed. Concussions are common in accidents or automobile collisions. A concussion involves the “shaking up” of brain matter. Severe head injuries must be evaluated by a neurosurgeon, who can determine the need for surgery or other medical treatment. More mild head injuries may need evaluation and treatment from a neuropsychologist who can assist with complaints of memory loss, concentration problems, and attention deficits.