Inclusion Criteria:  Male or female patient Patient treated in the Amiens University Hospital Patient treated for a glial or glioneuronal brain tumor according to the 2016 WHO Classification of Tumors of the Central Nervous System ("diffuse oligodendroglia or astrocytoma tumour," "another astrocytic tumor," "another glioma" or a "mixed neuronal or glioneuronal tumour"). Diagnosis histologically confirmed or formally established by radiologist. Diagnosis established between January 1, 2008 and December 31, 2020. No patient opposition (from adult patient, or from the holder of parental authority of the minor patient).  Exclusion Criteria:  Uncertain diagnosis Patient opposition (from adult patient, or from the holder of parental authority of the minor patient).