According to the O.M.S. Classification, grade 2 glioma is a pre-cancerous lesion, slowly
progressive, infiltrating the central nervous system, mainly affecting young adults.
This surgery should nevertheless be conducted in awake condition to achieve two conflicting
goals: get maximum brain tissue infiltrated by the tumor while preserving the integrity of
functional structures. So awake after opening the skull, the patient undergoes a series of
preoperative tests, administered by a speech therapist present in the operating room. This
procedure allows the neurosurgeon to establish an individual functional brain mapping in real
time, through the observation by the SLP of the patient's answers to direct electrical
stimulation applied to the cortical and sub-cortical. This support is based on the
extraordinary plasticity demonstrated by the brain in the presence of a slowly progressive
lesion. To ensure the patient the highest achievable load should increase our understanding
of brain function, including the neural bases of language, glioma grade 2 is predominantly
localized functional area of language.