6759
Despite the favourable natural history of acute BI , mild , moderate , and severe posttraumatic changes were shown to appear as cicatricial - adhesive and atrophic processes , intracerebral cysts , porencephaly , which result in posttraumatic epilepsy , hydrocephalus , etc .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None