EEG shows abnormal activity in some types of seizure disorder, but may or may not display abnormal findings in<unk> . To be diagnosed with<unk> , a person must have a history of head trauma and no history of seizures prior to the injury. Witnessing a seizure is the most effective way to diagnose<unk> . Electroencephalography (EEG) is a tool used to diagnose a seizure disorder, but a large portion of people with<unk>  may not have the abnormal "epileptiform" EEG findings indicative of<unk> . In one study, about a fifth of people who had normal EEGs three months after an injury later developed<unk> . However, while EEG is not useful for predicting who will develop<unk> , it can be useful to localize the epileptic focus, to determine severity, and to predict whether a person will suffer more seizures if they stop taking antiepileptic medications. Magnetic resonance imaging (MRI) is performed in people with<unk> , and CT scanning can be used to detect brain lesions if MRI is unavailable. However, it is frequently not possible to detect the epileptic focus using neuroimaging. For a diagnosis of<unk> , seizures must not be attributable to another obvious cause. Seizures that occur after head injury are not necessarily due to<unk>  or even to the head trauma. Like anyone else, TBI survivors may suffer seizures due to factors including imbalances of fluid or electrolytes,<unk>  from other causes, hypoxia (insufficient oxygen), and ischemia (insufficient blood flow to the brain). Withdrawal from alcohol is another potential cause of seizures. Thus these factors must be ruled out as causes of seizures in people with head injury before a diagnosis of<unk>  can be made.
Post-traumatic epilepsy
Musicogenic epilepsy
Generalized epilepsy
Temporal lobe epilepsy
Rolandic epilepsy
Vertiginous epilepsy
Catamenial epilepsy
Northern epilepsy syndrome