??? ??? ?? ? ? ?? ?? ??? ????? ??? ?? ??? ???? ??? ???? ?????.???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.A variant of ependymoma, usually found in the spinal twine, with tumor cells arranged in fascicles of variable width and mobile density.Retinoblastoma is often a malignant tumor on the acquiring retina that occurs in youngsters, ordinarily p