??? ??? ?? ? ? ?? ?? ??? ????? ??? ?? ??? ???? ??? ???? ?????.???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.A variant of ependymoma, usually located in the spinal twine, with tumor cells arranged in fascicles of variable width and mobile density.Retinoblastoma is a malignant tumor in the producing retina that happens in young children, ordinarily