I have Acoustic Nouroma Tumour, should I have full surgery or partial with radiation?

hi i`am a 31 year male that has been diagnosed with an Acoustic Nouroma Tumour which is 4 inches in size, that sits next to my brain stem 2 options for surgery 1) full removal with lots of risks 2) Middle of tumour removed with radiation but unsure how much radiation had when was a child with all cancer please advise on what choice I should make very unsure I have no records of how much radiation I have has in Sydney Children’s Hospital In 1989-1991.