| RISK FACTORS | REFERENCES | 
|---|---|
| Tumor-related risk factors Location Hydrocephalus | [19,20,21] | 
| Patient-related risk factors Age at diagnosis Neurofibromatosis type 1 | [22,23,24] | 
| Treatment-related factors Surgical complications Irradiation Doses of irradiation Volume of irradiation | [25,26][24][18,27][25,28] |