HI Thank for asking to HCM I am really sorry for your nephew s health issue, encephalopathy means the ill-health of brain and here the cause of this may the internal bleeding that have form the clot the entire process of recovery is depends upon the severity of disease and that include the size of clot and the damaged done by it to surrounding tissues although the chances of recovery said to be minimal because the time has gone away, as the date mentioned hare, but lets hope for the good, the perfects judgment demand the clinical examination, so this is just opinion based on history given here which could be differ after seeing the patient clinically, hope you can understand this have nice day.