Due to their benign biological behavior and favorable clinical course, they are classified in benign tumors, ie grade I according to the WHO classification. However, all tumors called DIA / DIG do not behave in a benign manner. Cases of metastatic cerebrospinal and malignant disorders have been described. It appears that about 40% of DIG cases require additional medical treatment such as chemotherapy, radiotherapy and / or new surgery, and 15% of infants and children with GIDD die from the disease. It is possible that what is grouped within the DIA / DIG is a heterogeneous group of tumors, evolution and prognosis very variable.