1- Astrocytoma, oligodendroglioma, ependymoma; False; 3- Absence or presence of p53 mutation and absence or expression of epithelial growth factor receptor ; 4- Pilocytic; 5- Brain stem, cerebellum; 6- true rosettes; 7- Rosenthal fibers; 8- Necrosis and vascular proliferation; 9- Necrosis; 10- One and nineteen; 11- Oligodendroglioma ; astrocytoma; 12- Medulloblastoma.