Most documented cases of chronic<unk><unk>  have occurred in athletes involved in contact<unk>  such as boxing, American football, wrestling, ice hockey, mixed martial arts, rugby and soccer. Other risk factors include being in the military, prior domestic violence, and repeated banging of the head. The exact amount of trauma required for the condition to occur is unknown. Below is a list of notable cases of CTE in<unk> .
Chronic traumatic encephalopathy in sports
Powassan encephalitis
Chronic solvent-induced encephalopathy
Rasmussen's encephalitis
Hashimoto's encephalopathy
Wernicke encephalopathy
Toxic encephalopathy
Viral encephalitis