my son 44 has CNS and after a stem cell transplant last November for his large-B cell non-hodgkins lymphoma and secondary CNS the CNS has come back within 6wks. Now they are saying he has an enormous amount of scar tissue from all the chemo & radiation and may only have 3-6 mo to live. They are giving him rituximab intra thecal and a chemo pill. His vision is clearing and his balance is better but his memory is till bad. I am wondering if there is any other hope for him out there?