Hello, as described the tumor is Benign and sticky and it has been removed, it means this benign tumor
is property of sort of infiltration in future, the cells might be active ,but encapsulated most probably and sited near by brain stem. After removal of such brain stem tumor it is must to take proper guidance by Oncologist
for the treatment of any possibility of remnants if any left by such brain tumor
,by the help of Chemotherapy
and Radiotherapy well in time .Hoping a good suggestion and guidance for you .Take care with good luck.