??? ??? ?? ? ? ?? ?? ??? ????? ??? ?? ??? ???? ??? ???? ?????.???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.A variant of ependymoma, generally present in the spinal cord, with tumor cells organized in fascicles of variable width and cell density.By adolescence, all folks with MLIV have extreme visual impairment. A neurodegenerative part of MLIV ha